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(期末典型真題)脫式計(jì)算-安徽省合肥市2023-2024學(xué)年五年級(jí)上冊(cè)數(shù)學(xué)期末必刷卷(蘇教版)試卷說(shuō)明:本試卷試題精選自安徽省合肥市市區(qū)、巢湖、廬江近兩年五年級(jí)上學(xué)期期末真題試卷,難易度均衡,適合安徽省合肥市市區(qū)、巢湖、廬江及使用蘇教版教材的五年級(jí)學(xué)生期末復(fù)習(xí)備考使用!1.下面各題怎樣簡(jiǎn)便就怎樣算。7.9+4.32+2.1+4.68

18.67—(8.67+4.21)4.7+1.25×4.8÷8

8.13×14-4×8.137.6×1.01

0.4×[1.7+(6.8-1.15)]2.用遞等式計(jì)算48048÷12+88;(1﹣0.8×)÷;(7.9﹣3.06÷0.68)×1.5.3.下面各題怎樣簡(jiǎn)便怎樣算.

4.脫式計(jì)算.5.8×4.5+5.8×5.5

0.038+9.9×0.38

6.48÷(0.12×2.7)32.8×1.6÷3.2

9.52÷3.4+7.2

0.36×9×2.55.脫式計(jì)算(能簡(jiǎn)算的要簡(jiǎn)算)7.56-1.34-2.66

9.36÷1.2×9.9+0.78

81.9÷(0.9×0.5)(2.7+2.7+2.7+2.7)×0.25

12.8÷[0.5×(45.5-29.5)]6.脫式計(jì)算。(能簡(jiǎn)便的請(qǐng)簡(jiǎn)便計(jì)算)5.33+1.11+3.67

0.75×7.5-0.75×3.5

[5×(2-1.916)]÷0.127.脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算。6.3×10.10.25×0.8×4×0.1250.75×18÷0.152.5×3.7+6.3×2.58.下面各題,怎樣算簡(jiǎn)便就怎么樣計(jì)算0.3×[1.7+(5.4-2.25)]

(18.1+14.6×0.5)÷2.54

1.25÷(5÷8)1.25×25×3.2

0.35×102

0.84×996.78-1.25-2.75+3.22

6.4÷2+3.2×9

12.2÷2.54+13.2÷2.549.計(jì)算下面各題,怎樣簡(jiǎn)便就怎樣算。48×1.25

99×1.47.7÷(14.2-3.2)×3.5

0.25×(0.9×4)10.簡(jiǎn)便計(jì)算12.25+(1.83+6.75)

3.45+5.56+5.556.75-(0.9+3.75)

94.54-(84.54-45.65)25.65-(7.12-4.35)

5.12-1.3+1.88-2.78.4×0.26+0.74×8.4

0.25×0.8×0.125×405.6×101-5.6

4×(0.25+4)11.遞等式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算:

(1)6.8×0.56+0.44×6.8

(2)8.7÷0.2÷0.512.下面各題,怎樣算簡(jiǎn)便就怎樣算。

13.怎樣簡(jiǎn)便就怎樣算。73.8-1.64-13.2-5.36

66.86-8.66-1.3436.8-3.9-6.1

13.75-(3.75+6.48)5.48-(5.4-0.52)

3.9-4.1+6.1-5.94.02+5.4+0.98

5.17-1.8-3.214.計(jì)算:7.42×9915.請(qǐng)用你學(xué)過(guò)的運(yùn)算定律計(jì)算下面兩題,并寫出主要過(guò)程。12.89+6.16+3.84

23.79-(4.06+3.79)16.脫式計(jì)算.

(1)39.6+5.63-28.7

(2)515.14-(10.28+1.5)

(3)70.9-1.25-1.75

(4)3.73+1.25+5.27+8.7517.用簡(jiǎn)便方法計(jì)算。275-169-31

57×99+57

0.58+13.64+1.4245×102

25×39×4

48×7.8+52×7.818.計(jì)算下面各題,能用簡(jiǎn)便方法計(jì)算的用簡(jiǎn)便方法計(jì)算.12.5×0.4×2.5×8

9.5×1014.2×7.8+2.2×4.2

0.87×3.16+4.646.8×0.75÷0.5

46.2×99+46.219.脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.6.85-2.13-1.87

28.5×10.1-28.5×0.13.4÷(0.5+0.3×4)

0.648÷〔(0.4+0.5)×0.6〕20.計(jì)算下面各題,怎樣簡(jiǎn)便就怎樣算。0.87×3.16+4.64

12.5×4.8100-2.7÷0.36-2.5×5

0.46×1.9+0.54×1.921.計(jì)算下面各題,能簡(jiǎn)算的要簡(jiǎn)算.①1.25×3.9×0.8②63.4÷2.5÷0.4③0.8×6.8﹣0.8×3.8④202×0.1522.用簡(jiǎn)便方法計(jì)算下列各題。2.5×(0.4+8)

9.6×11-9.623.用遞等式計(jì)算。

24.下面各題,能簡(jiǎn)算的要用簡(jiǎn)便方法計(jì)算。3.2×1.5+4.8÷2.5

1.25×0.78×8

97.97-3.36-6.640.89×99+0.89

6.48÷[(1.4-0.8)×0.9]25.用簡(jiǎn)便方法計(jì)算.(1)1.5×105(2)2.33×0.5×4(3)24.6+18.7+15.4(4)1.2×2.5+0.8×2.5.26.下面各題,怎樣簡(jiǎn)便就怎樣算。0.25×36

0.56×99+0.56

(31.6-11.7)÷2.5÷44.72-0.95+5.28-2.05

6.87×[40÷(3.49-3.09)]27.脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.3.6÷1.5÷228.脫式計(jì)算(能簡(jiǎn)算的要簡(jiǎn)算)(1)4.65﹣1.55﹣1.45(2)58.1﹣29.7÷3(3)201×3.5﹣3.5(4)2.2×0.25+0.25×1.8.29.脫式計(jì)算.3.52×8.6+8.6×0.481.25×8.87.3÷4+2.7×0.2530.用簡(jiǎn)便方法計(jì)算下列各題.2.5×1.02

9.43×101-9.43

12.5×6.4×0.252.76×37+63×2.76

27.8-(7.8+2.3)31.計(jì)算下面各題,能簡(jiǎn)便計(jì)算的要用簡(jiǎn)便方法計(jì)算。0.648÷[(0.4+0.5)×0.6]

3.72×3.5+6.28×3.510.95-(15.6÷8+3.9)

2.5×0.32×12.532.簡(jiǎn)便計(jì)算28.7×3.3+3.3×71.3217.2﹣25.6﹣75.4﹣17.225×32×1.25.33.計(jì)算下面各題,怎樣簡(jiǎn)便就怎樣算。0.44×2.5

2.25×0.4+0.6

31.04÷3.2-4.734.計(jì)數(shù)下面各題,能簡(jiǎn)算的要簡(jiǎn)算。

35.下列各題能簡(jiǎn)便的要簡(jiǎn)便計(jì)算。3.4-0.58+6.6-0.42

6.78×[9÷(5.97-5.07)](2.5+2.9)÷4÷1.5

6.8×3.9+3.9×3.26.8×9.9

6.8×39+3.9×3236.計(jì)算下面各題,能簡(jiǎn)算的要簡(jiǎn)算。3.42+5.73+6.58

35.7×101-35.7

4.4×0.257.68-(4.68+1.2)

2.4×[(1.3+2.7)÷0.2]37.計(jì)算下面各題。(怎樣簡(jiǎn)便就怎樣算)

38.用簡(jiǎn)便方法計(jì)算:(1)4.45+0.63+5.55

(2)6.58-(2.58+0.9)

(3)7.23+6.84-0.84+2.7739.下面各題怎樣算簡(jiǎn)便就怎樣算。0.8×3.37×12.5

6.87×[80÷(3.49-3.09)]

4.57-1.4+2.43-0.6

8.5÷2.5×101-3.440.脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算。

41.簡(jiǎn)便計(jì)算。0.73×0.25×4

0.37+1.37+0.63

7.6×0.8+0.2×7.65.78+0.84+0.16

12.5×0.96×8

1.27+3.9+0.73+6.10.25×36

1.28×8.6-0.28×8.6

2.4×1.029-4.37-0.63

0.45÷0.6÷0.5

5.52-0.55-0.4542.用簡(jiǎn)便方法計(jì)算下面各題.6.8×10230.94﹣5.09﹣4.915.4×2.3+5.4×7.73.2×12.5×0.25.43.能簡(jiǎn)算就簡(jiǎn)算。12.37-4.69-5.31

96÷[4×(1.34-0.14)]

5.95×9+5.95

8×(12.5+1.25)

44.計(jì)算下面各題,能簡(jiǎn)算的必須簡(jiǎn)算.9.5×1.06﹣2.52÷2.4

6.25÷1.25÷0.8

101×0.451.2×2.5+0.8×2.5

0.8×2.5×0.4×12.5

4.75×99+4.7545.用遞等式計(jì)算。6.27÷0.3+3

12.5×0.48×0.8

5.2×[(1.3+2.1)÷0.2]46.用簡(jiǎn)便方法計(jì)算.4.35+0.76+5.65

3.92+2.37+6.08+7.63

34.5-(6.98-5.5)47.用簡(jiǎn)便方法計(jì)算下列各題。15.6×1.01-15.6

3.29+32.9×9.94.56×12.4-4.56×3.4+4.56

(2.5-0.125)×4×0.848.能簡(jiǎn)算的要簡(jiǎn)算。

49.脫式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算。

50.計(jì)算下面各題,能簡(jiǎn)算的要簡(jiǎn)算.0.8×(12.5-1.25)4.27×0.74+0.26×4.2712.5×32×2.55.4×99+5.451.脫式計(jì)算。13-5.4+4.6

132+25×(40-4)52.計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.36÷0.18÷2

12.5×3.7×80.17×2.12+9.83×2.12

127.35÷4.5+4.6853.能簡(jiǎn)算的要用簡(jiǎn)便方法計(jì)算24.1×1.5+7.59×15

(3.7+17×0.4)÷3.5

75.36÷12﹣4.32×0.58.8×0.125

7.6×5.3+3.7×7.6

6.6÷(0.68+0.42)54.脫式計(jì)算.10-9.2+5.5

19.22+5.8-12.7855.用你喜歡的方法計(jì)算。23.7+9.9+8.1

142+25×(40-4)

9.6-0.75-0.25

8.9+4.7+2.1+5.356.簡(jiǎn)便計(jì)算。

(1)12.5×32×2.5

(2)0.88×10157.計(jì)算下面各題,能簡(jiǎn)算的要簡(jiǎn)算.9.8×4.3

1.25×0.32×0.253.4÷12.5÷0.8

28.4×99+28.4參考答案:1.19;5.79;5.45;81.3;7.676;2.94【分析】根據(jù)加法交換、結(jié)合律進(jìn)行簡(jiǎn)算;根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;先計(jì)算乘法再算除法,最后算加法;根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;原式化為7.6×(1+0.01),再根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;先算小括號(hào)里面的減法,再算中括號(hào)里面的加法,最后算乘法。【詳解】7.9+4.32+2.1+4.68=(7.9+2.1)+(4.32+4.68)=10+9=1918.67—(8.67+4.21)=18.67—8.67-4.21=10-4.21=5.794.7+1.25×4.8÷8=4.7+6÷8=4.7+0.75=5.458.13×14-4×8.13=8.13×(14-4)=8.13×10=81.37.6×1.01=7.6×(1+0.01)=7.6×1+7.6×0.01=7.6+0.076=7.6760.4×[1.7+(6.8-1.15)]=0.4×[1.7+5.65]=0.4×7.35=2.942.4092;0.5;5.1【詳解】試題分析:(1)先算除法,再算加法;(2)先算小括號(hào)里面的乘法,再算小括號(hào)里面的減法,最后算括號(hào)外的除法;(3)先算小括號(hào)里面的除法,再算小括號(hào)里面的減法,最后算括號(hào)外的乘法.解:(1)48048÷12+88=4004+88=4092(2)(1﹣0.8×)÷=(1﹣0.6)÷=0.4÷=0.5(3)(7.9﹣3.06÷0.68)×1.5=(7.9﹣4.5)×1.5=3.4×1.5=5.1【點(diǎn)評(píng)】本題考查了四則混合運(yùn)算,計(jì)算時(shí)先理清楚運(yùn)算順序,根據(jù)運(yùn)算順序逐步求解即可.3.19;2.83;5.61【詳解】略4.58;3.8;20;16.4;10;8.1【詳解】5.8×4.5+5.8×5.5=5.8×(4.5+5.5)=5.8×10=580.038+9.9×0.38=0.38×(9.9+0.1)=0.38×10=3.86.48÷(0.12×2.7)=6.48÷0.12÷2.7

=54÷2.7

=20

32.8×1.6÷3.2=52.48÷3.2=16.49.52÷3.4+7.2=2.8+7.2=100.36×9×2.5=(0.4×0.9)×9×2.5=(0.4×2.5)×(0.9×9)=1×8.1=8.15.3.56;78;182;2.7;1.6【詳解】7.56-1.34—2.66=7.56-(1.34+2.66)=7.56-4=3.569.36÷1.2×9.9+0.78=7.8×9.9+7.8×0.1=7.8×(9.9+0.1)=7881.9÷(0.9×0.5)=81.9÷0.9÷0.5=91×2=182(2.7+2.7+2.7+2.7)×0.25=2.7×(4×0.25)=2.7×1=2.72.8÷[0.5×(45.5-29.5)]=12.8÷[0.5×16]=12.8÷8=1.66.10.11;3;3.5【分析】(1)根據(jù)加法交換律簡(jiǎn)算;(2)根據(jù)乘法分配律簡(jiǎn)算;(3)先算小括號(hào)里的減法,再算中括號(hào)里的乘法,最后算中括號(hào)外的除法?!驹斀狻浚?)5.33+1.11+3.67=5.33+3.67+1.11=9+1.11=10.11(2)0.75×7.5-0.75×3.5=0.75×(7.5-3.5)=0.75×4=3(3)[5×(2-1.916)]÷0.12=[5×0.084]÷0.12=0.42÷0.12=3.57.63.63;0.1;90;25【詳解】解:(1)6.3×10.1=6.3×(10+0.1)=6.3×10+6.3×0.1=63+0.63=63.63(2)0.25×0.8×4×0.125=(0.25×4)×(0.8×0.125)=1×0.1=0.1(3)0.75×18÷0.15=13.5÷0.15=90(4)2.5×3.7+6.3×2.5=2.5×(3.7+6.3)=2.5×10=25【點(diǎn)評(píng)】考查學(xué)生對(duì)四則運(yùn)算法則以及運(yùn)算定律的掌握情況。8.1.45510

2

100

35.7

83.16

6

32

10【詳解】略9.60;138.62.45;0.9【分析】(1)把48分解成6×8,再運(yùn)用乘法結(jié)合律簡(jiǎn)算;(2)把99改寫成100-1,再運(yùn)用乘法分配律簡(jiǎn)算;(3)先算減法,再算除法,最后算乘法;(4)運(yùn)用“去括號(hào)”的方法和乘法交換律簡(jiǎn)算?!驹斀狻?8×1.25=6×(8×1.25)=6×10=60

99×1.4=(100-1)×1.4=100×1.4-1×1.4=140-1.4=138.67.7÷(14.2-3.2)×3.5

=7.7÷11×3.5=0.7×3.5=2.45

0.25×(0.9×4)=0.25×0.9×4=0.25×4×0.9=1×0.9=0.910.20.83

14.56

2.1

55.65

22.88

3

8.4

1

560

17【詳解】略11.(1)6.8;(2)87【詳解】(1)6.8×0.56+0.44×6.8=6.8×(0.56+0.44)=6.8×1=6.8(2)8.7÷0.2÷0.5=8.7÷(0.2×0.5)=8.7÷0.1=8712.15.43;5.42;37.514.5;84.15;64【分析】利用加法交換律,交換后兩個(gè)加數(shù)的位置;利用減法的性質(zhì),寫成連續(xù)減去兩個(gè)數(shù)的形式;先算加法,把12寫成4×3的形式再計(jì)算;先算小括號(hào)的除法,再算減法,最后算括號(hào)外的除法,把9.9寫成(10-0.1)利用乘法分配律計(jì)算;先算除法,再算加法?!驹斀狻?/p>

=3.32+6.68+5.43=10+5.43=15.43=15.26-6.26-3.58=9-3.58=5.42=0.25×12×12.5=0.25×4×3×12.5=3×12.5=37.5=(37-0.75)÷2.5=36.25÷2.5=14.5=(10-0.1)×8.5=10×8.5-0.1×8.5=85-0.85=84.15=24+40=6413.53.6;56.86;26.8;3.52;0.6;0;10.4;0.17【分析】(1)運(yùn)用“帶符號(hào)搬家”和減法的性質(zhì)簡(jiǎn)算;(2)(3)根據(jù)減法的性質(zhì)簡(jiǎn)算;(4)根據(jù)“去括號(hào)”的方法去掉括號(hào),再?gòu)淖笸乙来斡?jì)算;(5)根據(jù)“去括號(hào)”的方法去掉括號(hào),再運(yùn)用“帶符號(hào)搬家”的方法簡(jiǎn)算;(6)運(yùn)用“帶符號(hào)搬家”和減法的性質(zhì)簡(jiǎn)算;(7)運(yùn)用加法交換律簡(jiǎn)算;(8)根據(jù)減法的性質(zhì)簡(jiǎn)算?!驹斀狻?3.8-1.64-13.2-5.36=(73.8-13.2)-(1.64+5.36)=60.6-7=53.6

66.86-8.66-1.34=66.86-(8.66+1.34)=66.86-10=56.8636.8-3.9-6.1

=36.8-(3.9+6.1)=36.8-10=26.813.75-(3.75+6.48)=13.75-3.75-6.48=10-6.48=3.525.48-(5.4-0.52)=5.48-5.4+0.52=5.48+0.52-5.4=6-5.4=0.6

3.9-4.1+6.1-5.9=(3.9+6.1)-(4.1+5.9)=10-10=04.02+5.4+0.98

=4.02+0.98+5.4=5+5.4=10.45.17-1.8-3.2=5.17-(1.8+3.2)=5.17-5=0.1714.734.58【分析】根據(jù)7.42×99的特點(diǎn),把99換成100-1,原式化為:7.42×(100-1),在根據(jù)乘法分配律,原式化為:7042×100-7042×1,再進(jìn)行計(jì)算即可?!驹斀狻?.42×99=7.42×(100-1)=7.45×100-7.42×1=742-7.42=734.5815.22.89;15.94【分析】(1)根據(jù)加法結(jié)合律簡(jiǎn)算。(2)根據(jù)加法交換律、減法的性質(zhì)簡(jiǎn)算?!驹斀狻?2.89+6.16+3.84

=12.89+(6.16+3.84)=12.89+10=22.8923.79-(4.06+3.79)=23.79-(3.79+4.06)=23.79-3.79-4.06=20-4.06=15.9416.16.483.3667.919【詳解】略17.75;5700;15.644590;3900;780【分析】(1)利用減法的性質(zhì)進(jìn)行簡(jiǎn)算;(2)利用乘法分配律進(jìn)行簡(jiǎn)算;(3)先將13.64和1.42交換位置,然后再進(jìn)行計(jì)算;(4)將102分解成100+2,然后利用乘法分配律進(jìn)行計(jì)算;(5)利用乘法交換律交換39和4的位置,然后再進(jìn)行計(jì)算;(6)利用小數(shù)乘法的分配律進(jìn)行計(jì)算?!驹斀狻?75-169-31=275-(169+31)=275-200=7557×99+57=57×(99+1)=57×100=57000.58+13.64+1.42=0.58+1.42+13.64=2+13.64=15.6445×102=45×(100+2)=45×100+45×2=4500+90=459025×39×4=25×4×39=100×39=390048×7.8+52×7.8=(48+52)×7.8=100×7.8=78018.100959.5427.389210.24620【解析】略19.2.85

285

2

1.2【詳解】略20.7.3892;60;80;1.9【分析】0.87×3.16+4.64按照運(yùn)算順序先算乘法,再算加法;12.5×4.8把4.8寫成8×0.6的形式,再運(yùn)用乘法結(jié)合律進(jìn)行計(jì)算;100-2.7÷0.36-2.5×5按照運(yùn)算順序先算除法,再算乘法,最后運(yùn)用減法的性質(zhì)進(jìn)行計(jì)算;0.46×1.9+0.54×1.9運(yùn)用乘法分配律進(jìn)行計(jì)算?!驹斀狻?.87×3.16+4.64=2.7492+4.64=7.389212.5×4.8=12.5×(8×0.6)=12.5×8×0.6=100×0.6=60100-2.7÷0.36-2.5×5=100-7.5-12.5=100-(7.5+12.5)=100-20=800.46×1.9+0.54×1.9=(0.46+0.54)×1.9=1×1.9=1.921.①3.9

②63.4

③2.4

④30.3【分析】①根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;②根據(jù)除法性質(zhì)進(jìn)行簡(jiǎn)算;③根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;④把202改成200+2.然后根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.【詳解】①1.25×3.9×0.8=1.25×0.8×3.9=1×3.9=3.9②63.4÷2.5÷0.4=63.4÷(2.5×0.4)=63.4÷1=63.4③0.8×6.8﹣0.8×3.8=0.8×(6.8﹣3.8)=0.8×3=2.4④202×0.15=(200+2)×0.15=200×0.15+2×0.15=30+0.3=30.322.21;96【分析】根據(jù)乘法分配律進(jìn)行簡(jiǎn)算?!驹斀狻?.5×(0.4+8)=2.5×0.4+2.5×8=1+20=219.6×11-9.6=9.6×(11-1)=9.6×10=9623.40;22.6;10.2【分析】根據(jù)加法交換、結(jié)合律進(jìn)行簡(jiǎn)算;根據(jù)加法結(jié)合律進(jìn)行簡(jiǎn)算;根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算。【詳解】=(25.4+23.2)-8.6=48.6-8.6=40=20.6+(9.8-7.8)=20.6+2=22.6=16.2-(3.75+2.25)=16.2-6=10.224.6.72;7.8;87.9789;12【分析】3.2×1.5+4.8÷2.5,根據(jù)運(yùn)算法則,先計(jì)算乘除法,再計(jì)算加法;1.25×0.78×8,根據(jù)乘法交換律,原式化為:1.25×8×0.78,再進(jìn)行計(jì)算;97.97-3.36-6.64,根據(jù)減法性質(zhì),原式化為:97.97-(3.36+6.64),再進(jìn)行計(jì)算;0.89×99+0.89,根據(jù)乘法分配律,原式化為:0.89×(99+1),再進(jìn)行計(jì)算;6.48÷[(1.4-0.8)×0.9],先計(jì)算小括號(hào)里的減法,再計(jì)算中括號(hào)里的乘法,最后計(jì)算除法。【詳解】3.2×1.5+4.8÷2.5=4.8+1.92=6.721.25×0.78×8=1.25×8×0.78=10×0.78=7.897.97-3.36-6.64=97.97-(3.36+6.64)=97.97-10=87.970.89×99+0.89=0.89×(99+1)=0.89×100=896.48÷[(1.4-0.8)×0.9]=6.48÷[0.6×0.9]=6.48÷0.54=1225.(1)1.5×105=1.5×(100+5),=1.5×100+1.5×5,=150+7.5,=157.5;(2)2.33×0.5×4=2.33×(0.5×4),=2.33×2,=4.66;(3)24.6+18.7+15.4=(24.6+15.4)+18.7,=40+18.7,=58.7;(4)1.2×2.5+0.8×2.5=(1.2+0.8)×2.5,=2×2.5,=5.【詳解】試題分析:(1)把105拆成100+5,再根據(jù)乘法分配律進(jìn)行簡(jiǎn)算即可;(2)把0.5×4進(jìn)行結(jié)合,由乘法結(jié)合律進(jìn)行簡(jiǎn)算即可;(3)把18.7與15.4的位置進(jìn)行交換,再把24.6與15.4進(jìn)行結(jié)合,進(jìn)行簡(jiǎn)算即可;(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算即可.解:(1)1.5×105=1.5×(100+5),=1.5×100+1.5×5,=150+7.5,=157.5;(2)2.33×0.5×4=2.33×(0.5×4),=2.33×2,=4.66;(3)24.6+18.7+15.4=(24.6+15.4)+18.7,=40+18.7,=58.7;(4)1.2×2.5+0.8×2.5=(1.2+0.8)×2.5,=2×2.5,=5.【點(diǎn)評(píng)】根據(jù)題目給出的數(shù)據(jù),找準(zhǔn)所要使用的運(yùn)算定律進(jìn)行簡(jiǎn)算即可.26.9;56;1.997;687【分析】(1)先把36分解成4×9,再運(yùn)用乘法結(jié)合律簡(jiǎn)算;(2)運(yùn)用乘法分配律簡(jiǎn)算;(3)先計(jì)算減法,再根據(jù)除法的性質(zhì)簡(jiǎn)算;(4)運(yùn)用“帶符號(hào)搬家”的方法,把原式改寫為4.72+5.28-0.95-2.05,再根據(jù)減法的性質(zhì)簡(jiǎn)算;(5)根據(jù)小數(shù)四則混合運(yùn)算的順序,先算減法,再算除法,最后算乘法?!驹斀狻?.25×36=0.25×(4×9)=0.25×4×9=1×9=9

0.56×99+0.56=0.56×(99+1)=0.56×100=56

(31.6-11.7)÷2.5÷4=19.9÷(2.5×4)=19.9÷10=1.994.72-0.95+5.28-2.05=4.72+5.28-0.95-2.05=(4.72+5.28)-(0.95+2.05)

=10-3=7

6.87×[40÷(3.49-3.09)]=6.87×[40÷0.4]=6.87×100=68727.1.2【詳解】解:3.6÷1.5÷2=3.6÷(1.5×2)=3.6÷3=1.228.(1)解:4.65﹣1.55﹣1.45,=4.65﹣(1.55+1.45),=4.65﹣3,=1.65(2)解:58.1﹣29.7÷3,

=58.1﹣9.9,=58.1﹣(10﹣0.1),=58.1﹣10+0.1,=48.2(3)解:201×3.5﹣3.5,

=(201﹣1)×3.5,=200×3.5,=700(4)解:2.2×0.25+0.25×1.8,

=(2.2+1.8)×0.25,=4×0.25,=1【詳解】(1)運(yùn)用減法的性質(zhì)簡(jiǎn)算;(2)先算出發(fā),再算劍法;(3)(4)運(yùn)用乘法分配律簡(jiǎn)算.29.34.4;11;2.5【詳解】3.52×8.6+8.6×0.48

1.25×8.8=(3.52+0.48)×8.6

=1.25×(8+0.8)=4×8.6

=1.25×8+1.25×0.8=34.4

=117.3÷4+2.7×0.25=1.825+0.675=2.530.2.5×1.029.43×101-9.43=2.5×1+2.5×0.02

=9.43×(101-1)=2.5+0.05

=9.43×100=2.55

=94312.5×6.4×0.25=(12.5×8)×(4×0.25)×0.2=100×1×0.2=202.76×37+63×2.76=2.76×(37+63)=2.76×100=27627.8-(7.8+2.3)=27.8-7.8-2.3=20-2.3=17.7【詳解】略31.1.2;355.1;10【分析】(1)先算小括號(hào)里面的加法,再算中括號(hào)里面的乘法,最后算括號(hào)外面的除法;(2)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;(3)先算小括號(hào)里面的除法,再根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;(4)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算。【詳解】(1)0.648÷[(0.4+0.5)×0.6]=0.648÷[0.9×0.6]=0.648÷0.54=1.2(2)3.72×7.5+6.28×3.5=(3.72+6.28)×3.5=10×3.5=35(3)10.95-(15.6÷8+3.9)=10.95-(1.95+3.9)=10.95-1.95-3.9=9-3.9=5.1(4)2.5×0.32×12.5=2.5×(4×0.08)×12.5=(2.5×4)×(0.08×12.5)=10×1=1032.330;99;1000【詳解】試題分析:①根據(jù)乘法分配律進(jìn)行計(jì)算;②根據(jù)加法交換律和結(jié)合律以及減法性質(zhì)進(jìn)行計(jì)算;③把32寫成4×8,再根據(jù)乘法結(jié)合律計(jì)算.解:①28.7×3.3+3.3×71.3=3.3×(28.7+71.3)=3.3×100=330②217.2﹣25.6﹣75.4﹣17.2=(217.2﹣17.2)﹣(25.6+75.4)=200﹣101=99③25×32×1.25=25×(4×8)×1.25=(25×4)×(8×1.25)=100×10=1000【點(diǎn)評(píng)】完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.33.1.1;1.5;5【分析】0.44×2.5,把0.44化成0.4+0.04,原式化為:(0.4+0.04)×2.5,再根據(jù)乘法分配律,原式化為:0.4×2.5+0.04×2.5,再進(jìn)行計(jì)算;2.25×0.4+0.6,按照運(yùn)算順序,先計(jì)算乘法,再計(jì)算加法;31.04÷3.2-4.7,按照原式順序,先計(jì)算除法,再計(jì)算減法?!驹斀狻?.44×2.5=(0.4+0.04)×2.5=0.4×2.5+0.04×2.5=1+0.1=1.12.25×0.4+0.6=0.9+0.6=1.531.04÷3.2-4.7=9.7-4.7=534.3.79;16.3;63;0.6【分析】第1題,應(yīng)用加法交換律進(jìn)行湊整;第2題,應(yīng)用乘法結(jié)合律進(jìn)行湊整;第3題,應(yīng)用乘法分配律進(jìn)行簡(jiǎn)便計(jì)算;第4題,連續(xù)除以兩個(gè)數(shù),等于除以這兩個(gè)數(shù)的積?!驹斀狻?5.9;67.8;0.9;39;67.32;390【分析】3.4-0.58+6.6-0.42,根據(jù)帶符號(hào)搬家和減法的性質(zhì),將算式變?yōu)椋?.4+6.6)-(0.58+0.42)進(jìn)行簡(jiǎn)算即可;6.78×[9÷(5.97-5.07)],先計(jì)算小括號(hào)里面的減法,再計(jì)算中括號(hào)里面的除法,最后計(jì)算中括號(hào)外面的乘法;(2.5+2.9)÷4÷1.5,先計(jì)算括號(hào)里面的加法,再根據(jù)除法的性質(zhì),將算式變?yōu)?.4÷(4×1.5)進(jìn)行簡(jiǎn)算即可;6.8×3.9+3.9×3.2,根據(jù)乘法分配律,將算式變?yōu)椋?.8+3.2)×3.9進(jìn)行簡(jiǎn)算即可;6.8×9.9,先把9.9變?yōu)?0-0.1,然后根據(jù)乘法分配律,將算式變?yōu)?.8×10-6.8×0.1進(jìn)行簡(jiǎn)算即可;6.8×39+3.9×32,先根據(jù)積不變性質(zhì),將算式變?yōu)?.8×39+39×3.2,然后根據(jù)乘法分配律,將算式變?yōu)椋?.8+3.2)×39進(jìn)行簡(jiǎn)算即可?!驹斀狻?.4-0.58+6.6-0.42=3.4+6.6-0.58-0.42=(3.4+6.6)-(0.58+0.42)=10-1=96.78×[9÷(5.97-5.07)]=6.78×[9÷0.9]=6.78×10=67.8(2.5+2.9)÷4÷1.5=5.4÷4÷1.5=5.4÷(4×1.5)=5.4÷6=0.96.8×3.9+3.9×3.2=(6.8+3.2)×3.9=10×3.9=396.8×9.9=6.8×(10-0.1)=6.8×10-6.8×0.1=68-0.68=67.326.8×39+3.9×32=6.8×39+39×3.2=(6.8+3.2)×39=10×39=39036.15.73;3570;1.11.8;48【分析】3.42+5.73+6.58,根據(jù)加法交換律,原式化為:3.42+6.58+5.73,再進(jìn)行計(jì)算;35.7×101-35.7,根據(jù)乘法分配律,原式化為:35.7×(101-1),再進(jìn)行計(jì)算;4.4×0.25,把4.4化成4+0.4,原式化為:(4+0.4)×0.25,再根據(jù)乘法分配律,原式化為:4×0.25+0.4×0.25,再進(jìn)行計(jì)算;7.68-(4.68+1.2),根據(jù)減法性質(zhì),原式化為:7.68-4.68-1.2,再進(jìn)行計(jì)算;2.4×[(1.3+2.7)÷0.2],先計(jì)算小括號(hào)里的加法,再計(jì)算中括號(hào)里的除法,最后計(jì)算括號(hào)外的乘法,【詳解】3.42+5.73+6.58=3.42+6.58+5.73=10+5.73=15.7335.7×101-35.7=35.7×(101-1)=35.7×100=35704.4×0.25=(4+0.4)×0.25=4×0.25+0.4×0.25=1+0.1=1.17.68-(4.68+1.2)=7.68-4.68-1.2=3-1.2=1.82.4×[(1.3+2.7)÷0.2]=2.4×[4÷0.2]=2.4×20=4837.650;4.75;5.79;100【分析】原式化為:6.5×99+6.5×1,再根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;先算小括號(hào)里面的減法,再根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;原式化為:25×1.25×4×0.8,再根據(jù)乘法交換、結(jié)合律進(jìn)行簡(jiǎn)算?!驹斀狻浚?.5×99+6.5×1=6.5×(99+1)=6.5×100=650=4.75÷(2.5×0.4)=4.75÷1=4.75=18.67-8.67-4.21=10-4.21=5.79=25×1.25×4×0.8=(25×4)×(1.25×0.8)=100×1=10038.(1)10.63(2)3.1(3)16【詳解】(1)4.45+0.63+5.55=4.45+5.55+0.63=10+0.63=10.63(2)6.58-(2.58+0.9)=6.58-2.58-0.9=4-0.9=3.1

(3)7.23+6.84-0.84+2.77=(7.23+2.77)+(6.84-0.84)=10+6=1639.33.7;13745;340【分析】(1)運(yùn)用乘法交換律簡(jiǎn)算;(2)按照小數(shù)四則混合運(yùn)算的順序,先算減法,再算除法,最后算乘法;(3)運(yùn)用“帶著符號(hào)搬家”的方法,原式=4.57+2.43-1.4-0.6,再根據(jù)減法的性質(zhì)簡(jiǎn)算;(4)先計(jì)算除法的商得3.4,再運(yùn)用乘法分配律簡(jiǎn)算?!驹斀狻?.8×3.37×12.5=0.8×12.5×3.37=10×3.37=33.7

6.87×[80÷(3.49-3.09)]

=6.87×[80÷0.4]=6.87×200=13744.57-1.4+2.43-0.6

=4.57+2.43-1.4-0.6=(4.57+2.43)-(1.4+0.6)=7-2=5

8.5÷2.5×101-3.4=3.4×101-3.4=3.4×(101-1)=3.4×100=34040.1.74;7;2.8【分析】2.3-1.45+0.89,按照運(yùn)算順序,先計(jì)算減法,再計(jì)算減法;1.34+1.8+3.66+0.2,根據(jù)加法交換律,原式化為:1.34+3.66+1.8+0.2,再根據(jù)加法結(jié)合律,原式化為:(1.34+3.66)+(1.8+0.2),再進(jìn)行計(jì)算;12.8-4.9-5.1,根據(jù)減法性質(zhì),原式化為:12.8-(4.9+5.1),再進(jìn)行計(jì)算。【詳解】2.3-1.45+0.89=0.85+0.89=1.741.34+1.8+3.66+0.2=1.34+3.66+1.8+0.2=(1.34+3.66)+(1.8+0.2)=5+2=712.8-4.9-5.1=12.8-(4.9+5.1)=12.8-10=2.841.0.73;2.37;7.6;6.78;96;12;9;8.6;2.448;4;1.5;4.52【分析】0.73×0.25×4根據(jù)乘法結(jié)合律簡(jiǎn)算;0.37+1.37+0.63根據(jù)加法交換律簡(jiǎn)算;7.6×0.8+0.2×7.6根據(jù)乘法分配律簡(jiǎn)算;5.78+0.84+0.16根據(jù)加法結(jié)合律簡(jiǎn)算;12.5×0.96×8根據(jù)乘法交換律簡(jiǎn)算;1.27+3.9+0.73+6.1根據(jù)加法交換律和加法結(jié)合律簡(jiǎn)算;0.25×36把36分成4和9,根據(jù)乘法結(jié)合律簡(jiǎn)算;1.28×8.6-0.28×8.6根據(jù)乘法分配律簡(jiǎn)算;2.4×1.02把1.02分成1與0.02的和,再根據(jù)乘法分配律簡(jiǎn)算;9-4.37-0.63根據(jù)減法的性質(zhì)簡(jiǎn)算;0.45÷0.6÷0.5根據(jù)除法的性質(zhì)簡(jiǎn)算;5.52-0.55-0.45根據(jù)減法的性質(zhì)簡(jiǎn)算?!驹斀狻?.73×0.25×4=0.73×(0.25×4)=0.73×1=0.730.37+1.37+0.63=0.37+0.63+1.37=1+1.37=2.377.6×0.8+0.2×7.6=7.6×(0.8+0.2)=7.6×1=7.65.78+0.84+0.16=5.78+(0.84+0.16)=5.78+1=6.7812.5×0.96×8=12.5×8×0.96=100×0.96=961.27+3.9+0.73+6.1=(1.27+0.73)+(3.9+6.1)=2+10=120.25×36=0.25×(4×9)=0.25×4×9=1×9=91.28×8.6-0.28×8.6=(1.28-0.28)×8.6=1×8.6=8.62.4×1.02=2.4×(1+0.02)=2.4×1+2.4×0.02=2.4+0.048=2.4489-4.37-0.63=9-(4.37+0.63)=9-5=40.45÷0.6÷0.5=0.45÷(0.6×0.5)=0.45÷0.3=1.55.52-0.55-0.45=5.52-(0.55+0.45)=5.52-1=4.5242.(1)6.8×102=6.8×(100+2)=6.8×100+6.8×2=680+13.6=693.6(2)30.94﹣5.09﹣4.91=30.94﹣(5.09+4.91)=30.94﹣10=20.94(3)5.4×2.3+5.4×7.7=5.4×(2.3+7.7)=5.4×10=54(4)3.2×12.5×0.25=(4×0.8)×12.5×0.25=(4×0.25)×(0.8×12.5)=1×10=10【詳解】解:(1)6.8×102=6.8×(100+2)=6.8×100+6.8×2=680+13.6=693.6(2)30.94﹣5.09﹣4.91=30.94﹣(5.09+4.91)=30.94﹣10=20.94(3)5.4×2.3+5.4×7.7=5.4×(2.3+7.7)=5.4×10=54(4)3.2×12.5×0.25=(4×0.8)×12.5×0.25=(4×0.25)×(0.8×12.5)=1×10=10【點(diǎn)評(píng)】考查學(xué)生對(duì)四則運(yùn)算法則以及運(yùn)算定律與運(yùn)算性質(zhì)的掌握情況.43.2.37;20;59.5;110【分析】利用減法的性質(zhì),連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和;先算小括號(hào)的減法,再算中括號(hào)的乘法,最后算括號(hào)外的除法;利用乘法分配律計(jì)算;利用乘法分配律計(jì)算?!驹斀狻?2.37-4.69-5.31=12.37-(4.69+5.31)=12.37-10=2.37;96÷[4×(1.34-0.14)]=96÷[4×1.2]=96÷4.8=20;5.95×9+5.95=5.95×(9+1)=5.95×10=59.5;8×(12.5+1.25)=8×12.5+8×1.25=100+10=11044.(1)9.5×1.06﹣2.52÷2.4=10.07﹣1.05=9.02(2)6.25÷1.25÷0.8=6.25÷(1.25×0.8)=6.25÷1=6.25(3)101×0.45=(100+1)×0.45=100×0.45+0.45=45+0.45=45.45(4)1.2×2.5+0.8×2.5=(1.2+0.8)×2.5=2×2.5=5(5)0.8×2.5×0.4×12.5=(0.8×12.5)×(2.5×0.4)=10×1=10(6)4.75×99+4.75=4.75×(99+1)=4.75×100=475【詳解】試題分析:(1)先算乘除法,再算減法;(2)根據(jù)除法的性質(zhì)簡(jiǎn)便計(jì)算;(3)(4)(6)根據(jù)乘法分配律簡(jiǎn)便計(jì)算;(5)根據(jù)乘法交換律和結(jié)合律簡(jiǎn)便計(jì)算.解:(1)9.5×1.06﹣2.52÷2.4=10.07﹣1.05=9.02(2)6.25÷1.25÷0.8=6.25÷(1.25×0.8)=6.25÷1=6.25(3)101×0.45=(100+1)×0.45=100×0.45+0.45=45+0.45=45.45(4)1.2×2.5+0.8×2.5=(1.2+0.8)×2.5=2×2.5=5(5)0.8×2.5×0.4×12.5=(0.8×12.5)×(2.5×0.4)=10×1=10(6)4.75×99+4.75=4.75×(99+1)=4.75×100=475【點(diǎn)評(píng)】考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.45.23.9;4.8;88.4【分析】先算除法,再算加法;根據(jù)乘法交換、結(jié)合律進(jìn)行簡(jiǎn)算;先算小括號(hào)里面的加法,再算中括號(hào)里面的除法,最后算括號(hào)外面的乘法?!驹斀狻?.27÷0.3+3=20.9+3=23.912.5×0.48×0.8=(12.5×0.8)×0.48=10×0.48=4.85.2×[(1.3+2.1)÷0.2]=5.2×[3.4÷0.2]=5.2×17=88.446.10.76;20;33.02【詳解】解:(1)4.35+0.76+5.65=4.35+5.65+0.76=10+0.76=10.76(2)3.92+2.37+6.08+7.63=(3.92+6.08)+(2.37+7.63)=10+10=20(3)34.5-(6.98-5.5)=34.5-6.98+5.5=34.5+5.5-6.98=40-6.98=33.0247.0.156;329;45.6;7.6【分析】根據(jù)乘法分配律對(duì)各算式進(jìn)行簡(jiǎn)算即可?!驹斀狻?5.6×1.01-15.6=15.6×(1.01-1)=15.6×0.01=0.1563.29+32.9×9.9=3.29×(1+99)=3.29×100=3294.56×12.4-4.56×3.4+4.56=4.56×(12.4-3.4+1)=4.56×10=45.6(2.5-0.125)×4×0.8=2.5×4×0.8-0.125×4×0.8=8-0.4=7.648.8;16.2;70.9;2.8【分析】通過(guò)觀察可以交換加數(shù)與減數(shù)的位置進(jìn)行湊整簡(jiǎn)算;運(yùn)用乘法交換律,交換16.2與4的位置后,即可通過(guò)0.25×4湊整簡(jiǎn)算;

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