(43)小數(shù)加減法專項(xiàng)練習(xí)200題(有答案)

1、(43)小數(shù)加減法專項(xiàng)練習(xí)200題(有答案)ok小數(shù)加減法專項(xiàng)練習(xí)200題（有答案1)7.4+12.8610)12.42+0.48(2)205.67411)0.56+11.534(3)141.248.98(12)44-22.134102+4.36(13)91-22.035(5)32.15-27.4514)52.6+21.237612.9+5.01(15)9.15-2.1829.46(9.46+3.8)(16)3.85-1.5+1.32,17) 15.4+6.8718) 3.56+27.84(8) 15.75+0.65-2.75+3.35(9) 65.71-4.99(20)123.56-47.9

2、+51.7(30)57.5-3.2516.75,212.7+3.1+2.9+3.2，316.02+3.6+1.982228.42+19.48321.29+3.7+2.71+6.32342.56+3.124(33)3.07-0.381.62(24)81-30.75(34)3.25+1.79-0.59+1.752515.6十0.237(35)7.5+4.9-6.1(26)148.2-25.62-24.38(36)14.8+7.9-4.8(27)4.52-0.74-0.26372.608+2.84280.42+5.4+1.58+2.6(38)6.07-3.8694076.8+26.82(50)17.

3、176.8-3.2-6.17(41)102.07-37.257(51)73.8-1.64-13.85.364248.64+18.6(52)6.75(0.9+3.75)(43) 54.75-5.2514.75,(53)27.38-5.34+2.62-4.66(44) 4.68+14.79+5.32-10.79,(54) 35.724.9(5.72+5.1)(45) 48.9 12.7 -0.3 ,(55) 0.73-0.25-0.73+0.25(46) 56.4-39.7+24.3,(56)5.3+0.1+5.3-0.1(47) 3.62.8+3.47.2,(57) 12.7-4.8-5.2.4

4、83.67+18.5+6.33，(58) 23.256.753.25(60) 9.053.863.14(70) 27042.517.5(61) 20-9.18 -0.82(71) 15.68(7.784.32)2.32,(62) 6.53(1.53+2.6)720.9+9.9+99.9+999.9，(63) 5.521.0740.926(73) 25.468.23-1.76,64 4.21+1.04+0.79(74) 9.4+0.36.4,651.36+4.85+2.64+6.157515.25+4.72+4.75+5.28，(66) 83.7 12.83 -0.17(76) 34.823(4

5、.82+15.2),67 4.32+5.43+6.68(77) 12.7-4.8-5.2,(68)17.17-6.8-3.2,783.1+25.78+6.9，2.15+8.73+1.27+7.85(90)15.17(3.6+4.9),11.87(8.2+1.87),(91)35.6+(12.6-4.4),798081828384858687885.42 -3.87 1.13 ,4.38 - 1.56+0.62 0.44 ,(93) 4.65 -2.55 - 1.45 ,9216.4+3.5+83.6+166.546.7 15.03 -4.97941.28+0.86+38.72，4.52+0.6

6、1+1.39+6.48(95) 25.743.576.43,4.27(1.96-1.73)(96) 14.5-4.68-5.32,7.27(1.98+0.27),970.485+0.64+3.36，13.7+8.65 - 9.628(98)72.519.3412.661005.76+2.43+0.24+10.57，(110) 27.73(4.73-1.85),(101)9.28(3.28+2.55),(111)3.84+26.5(20-8.6),(102)9.5+4.856.13,(112)7.385.14+3.62-2.86,(103)10.751.86-2.753.16,(113)5.86

7、+13.08-9.27,1041.3+0.94+0.06+7.7，(114) 25.4-(15.46.4),105 4.45+0.63+5.55 ，116 4.45+0.63+5.55 ，(107) 0.96 - 0.28+0.04 -0.72 ,(117) 5.28 (2.9+1.28 ),(115) 47.23-7.23-5.89,(106)45.5-(0.98+5.5),108 12.7+12.5+0.5 ，(118)5.25+7.86-2.86+4.75,120 9.42+7.39+1.58 ，(121) 18.4 -1.6 -5.4 ,(122) 75.7+39.4 23.86,(1

8、32) 10.75 (2.4 0.86 ),(123) 21.21+38.38 - 9.79,(133) 9.61 - 4.38+0.35 ,124 47.28+1.39+52.72 ，134 3.87+4.92+1.13 ，(125) 2.45 - 1.68+1.54 ,(135) 46.24 -8.66 - 1.34,(130)4.26+5.481.26+4.52,13114.67+25.91+15.33+4.09，(126) 15- 8.13 1.87,(136) 21.99.220.78+8.1,(127)5.14+3.2256.302,(137) 35.47+39.8812.37,(

9、128)3.95+5.361.95,(138) 93.21-5.9914.01,150 1.3+2.83+8.7+0.17 ，(140) 42.37(12.379.78),(151) 2.47 2.2 - 3.8+7.53 ,(141) 38.78-19.59+41.22-30.41,1421.9+19.9+199.9+0.31526.89+4.7+2.11+5.3，143 429+31.1+2.04 ，(153)7.462.37-1.63,(144) 100-27.2-42.8,(154)14-(3.65+0.24),(145) 9-(3.02+1.25),(155) 70.8-1.25-1

10、.75,(146) 1.8 - 1.57+0.2 ,1565.81+8.3+4.19+11.7，(147) 5.03-2.5+0.96,1574.2+7.64+5.8+2.36，(148) 35.72(5.9+5.72),(158)14.282.637.37,(160) 6.213.8+2.2,1704.7+7.69+5.3+2.311616.03+3.7+2.97，(171)53.78-13.6-37.4+6.22,(162)17.43-6.572.43,(172)60-(21.58.8)+7.3,(163)20.47(1.47+6.8),(173)9.5+4.856.13,16413.26

11、+4.71+3.47+5.29，(174) 75.8-(15.3-4.8),(165)22.74+8.6813.74,(175) 51.27-8.66-1.34,(166)12.56-6.643.36,(176) 28.43.961.04+4.6,(167)45.5(0.98+5.5),(177) 70.87.251.75168 13.6+7.94+6.41785.81+8.3+4.19+11.7(180) 6756 193-207,(190)11.72-7.85-(1.26+0.46),1810.9+1.08+0.92+0.119115.37+28.44+12.56，(182)13.59-6

12、.910.09,(192) 12.64-(3.96+4.64),1834.58+3.38+(5.48+6.62(193) 36.26-4.78+3.74,(184) 73.75(4.3+8.75)1947.34+7.57+12.66+6.43，(185) 5-(4.19-2.83),(195) 78.65-23.1214.88,1861.39+0.72+0.61+3.28，1954.58+2.39+(5.42+7.61，(187) 8-3.7 -6.3 ,1968.27+5.84+1.73+2.16，(188)8.28-(1.28+3.7),(197)18.51-9.08-0.92,199 7

13、.85+6.76+2.15(209)3.78-1.46+1.54,(200) 18.433.767.24(210)8.45(5.45+2.98)(201) 21.65+(4.8-3.65)2113.01+8.2+6.99+1.8，(202) 9.64(4.64-1.23)(212) 4.3(5.98-5.7),(203)2.7+17.6+3.3-5.6(213) 5.520.550.45,(204)9.87-3.5+2.138.5(214)19.6-26.72+80.4-3.28，2055.64+4.97+0.03，(215) 27.510.80.2,(216) 43.5+18 - 13.5

14、,(206)10.933.744.26,(207) 10- 6.8 -3.2 ,(217)63.5-(43.5+20),(219)12.566.643.36,(225) 32.63+7.896.4,(220)45.5-(0.98+5.5),(226) 3.97+0.7-1.32,221 6+7.94+6.4 ，(227) 30-(3.8+0.75),(222) 5.41+3.462.46,(228)75.6-(14.3-8.3),(223) 2.03-0.18-2.82+7.97,參考答案:(1)7.4+12.86=20.26;7.4二12.B620.26(2)20-5.674=14.326;

15、20-5.674=13+4,二17；(9) 65.71-4.99,=65.71-(5-0.01),=65.71-5+0.01,=60.71+0.01,=60.72;(10) 12.42+0.48=12.9,(11) 0.56+11.534=12.094,(12) 44-22.13=21.87,44-22.1321.87(13) 91-22.035=68.965,91-22.035風(fēng)965(14) 52.6+21.237=73.837,14326(3) 141.2-48.98=92.22;141.2-4&兜92.22(4) 102+4.36=106.36;102|+4.36靛,36(5) 32.

16、15-27.45=4.7;32.15-27.454.7驗(yàn)算：27.45-4.732.15(6)12.9+5.01=17.91;12.9- 5.01- 17.9驗(yàn)算：17.91- 129- 5.01-29.46-(9.46+3.8),=29.46-9.46-3.8,=20-3.8,=16.2;(8)15.75+0.65-2.75+3.35,=(15.752.75)+(0.65+3.35),52.6+21.23773.237(15) 9.15-2.18=6.97.9.15-2.186. 97(16) 3.85-1.5+1.32,=2.35+1.32,=3.67;(17) 15.4+6.87=22.

17、271 5-4十6.872 2.27驗(yàn)算：3 2.27-15.46.87(18)3.56+27.84=31.43.56+27-8431.40驗(yàn)算：31.4-27.84(19)100-82.13=17.8717.87驗(yàn)算:驗(yàn)算:17.87十82.131U0.00(20) 123.56-47.9+51.7=127.361 23.50-47.975.66+51.7127.36驗(yàn)算：127.365E71 23.56(21) 2.7+3.1+2.9+3.2,=2.7+(3.1+2.9)+3.2,=2.7+6+3.2,=11.9.(22) 28.42+19.48=47.928,42+19,4S47.90驗(yàn)

18、算：47.9-28.4219.48(23) 42.56+3.124=45.6844 2.5b+3.124驗(yàn)算:4 & 93. 181-30.75=50.2510.755 (I.25驗(yàn)算：50.25*30.75S1.0U(25) 15.6十0.237=15.8371 5.S+0.23715.8372 5.837-19.60.237(26) 148.2-25.62-24.38=148.2-(25.62+24.38),=148.2-50,=98.2.(27) 4.52-0.74-0.26=4.52-(0.74+0.26)=4.52-1=3.52;(28) 0.42+5.4+1.58+2.6=(0.4

19、2+1.58)+(5.4+2.6)=2+8=10;(29) 5.9+28.65-16.57=17.98;2,65+5.934.55-16.5717.98(30) 57.5-3.25-16.75,=57.5-(3.25+16.75),=57.5-20,=37.5;(31) 6.02+3.6+1.98=6.02+1.98+3.6,=8+3.6,=11.6;(32) 1.29+3.7+2.71+6.3=(1.29+2.71)+(3.7+6.3),=4+10,=14;(33) 3.07-0.38-1.62=3.07-(0.38+1.62),=3.07-2,=1.07;(34) 3.25+1.79-0.

20、59+1.75=(3.25+1.75)+(1.79-0.59),=5+1.2,=6.2;(35) 7.5+4.9-6.1=12.4-6.1,=6.3;(36) 14.8+7.9-4.8=14.8-4.8+7.9,=10+7.9=17.9(37) 2.608+2.84=5.448,2.602+2.冽5. 448(38) 6.07-3.869=2.201,6. 07-3.8692.201(39) 1.5-0.306=1.194,1.5-0.306|1.14(40) 76.8+26.82=103.62,76.S+26.82103.62(41)102.07-37.257=64.813,102.07-3

21、,257S4.913(42)48.64+18.6=67.24.48. 64+18.667. 24(43) 54.75-5.25-14.75,=54.75-(14.75+5.25),=54.75-20,=34.75;(44) 4.68+14.79+5.32-10.79,=(4.68+5.32)+(14.79-10.79),=10+4,=14;(45) 48.9-12.7-0.3,=48.9-(12.7+0.3),=48.9-13,=35.9;(46) 56.4-39.7+24.3,=16.7+24.3,=41;(47) 3.6-2.8+3.4-7.2,=(3.6+13.4)-(2.8+7.2),

22、=17-10,=7；(48) 3.67+18.5+6.33,=(3.67+6.33)+18.5,=10+18.5,=28.5;(49) 120-17.83-2.17,=120-17.83-2.17,=120-(17.83+2.17),=120-20,=100;(50) 17.17-6.8-3.2-6.17=(17.17-6.17)-(6.8+3.2),=11-10,=1；(51) 73.8-1.64-13.8-5.36=73.8-13.8-(1.64+5.36),=60-7,=53;(52) 6.75-(0.9+3.75)=6.75-3.75-0.9,=3-0.9,=2.1；(53) 27.3

23、8-5.34+2.62-4.66=22.04+2.62-4.66,=24.66-4.66,=20;(54) 35.72-4.9-(5.72+5.1)=35.72-(4.9+5.72+5.1),=35.72-15.72,=20;(55) 0.73-0.25-0.73+0.25=0.75-0.75-0.25+0.25,=0-0.25+0.25,=0-0,=0；(56) 5.3+0.1+5.3-0.1=5.3+5.3+0.1-0.1,=10.6+0.1-0.1,=10.7-0.1,=10.6;(57) 12.7-4.8-5.2.=12.7-(4.8+5.2);=12.7-10,=2.7.(58) 2

24、3.25-6.75-3.25=23.25-(6.75+3.25),=23.25-10,=13.25.(59) 4.58+2.39+(5.42+7.61)=(4.58+5.42)+(2.39+7.61)=10+10,=20；(60) 9.05-3.86-3.14,=9.05-(3.86+3.14),=9.05-7,=2.05；(61) 20-9.18-0.82,=20-(9.18+0.82),=20-10,=10(62) 6.53-(1.53+2.6),=6.53-1.53-2.6,=4-2.6,=1.4(63) 5.52-1.074-0.926,=5.52-(1.074+0.926),=5.5

25、2-2,=3.52(64) 4.21+1.04+0.79，=4.21+0.79+1.04，=5+1.04，=6.04(65) 1.36+4.85+2.64+6.15，=(1.36+2.64)+(4.85+6.15)，=4+11，=15；(66) 83.7-12.83-0.17,=83.7-(12.83+0.17),=83.7-13,=70.7；(67) 67)4.32+5.43+6.68，=4.32+6.68+5.43，=11+5.43，=16.43；(68) 17.17-6.8-3.2,=17.17-(6.8+3.2),=17.17-10,=7.17；(69) 1+12.7+5.9+17.3

26、=1+(12.7+17.3)+5.9，=1+30+5.9，=36.9；(70) 270-42.5-17.5=270-(42.5+17.5),=270-60,=210；(71) 15.68-(7.78-4.32)-2.32,=15.68-7.78+4.32-2.32,=(15.68+4.32)(7.78+2.32),=20-10,=10；(72) 0.9+9.9+99.9+999.9，=1-0.1+10-0.1+100-0.1+1000-0.1,=(1+10+100+100。-(0.1+0.1+0.1+0.1),=1111-0.4,=1110.6(73) 25.46-8.23-1.76,=25.

27、46-(8.23+1.76),=25.46-9.99=15.45；(74) 9.4+0.3-6.4,=(9.4-6.4)+0.3,=3+0.3，=3.3；(75) 75)15.25+4.72+4.75+5.28，=(15.25+4.75)+(4.72+5.28)，=20+10，=30；(76) 34.823-(4.82+15.2),=34.823-4.82-15.2,=30.003-15.2,=14.803；(77) 12.7-4.8-5.2,=12.7-(4.8+5.2),=12.7-10,=2.7；(78) 3.1+25.78+6.9，=(3.1+6.9)+25.78，=10+25.78，

28、=35.78；(79) 73.8-1.64-13.8-5.36,=(73.8-13.8)-(1.64+5.36),=60-7,=53(80) 2.15+8.73+1.27+7.85=(2.15+7.85)+(8.73+1.27)，=10+10，=20；(81) 11.87-(8.2+1.87),=11.87-1.87-8.2,=10-8.2,=1.8；(82) 5.42-3.87-1.13,=5.42-5,=0.42；(83) 4.38-1.56+0.62-0.44,=(4.38+0.62)(1.56+0.44),=5-2,=3；(84) 46.7-15.03-4.97=46.7-(15.03

29、+4.97),=46.7-20,=26.7；(85) 4.52+0.61+1.39+6.48=(4.52+6.48)+(0.61+1.39)，=11+2，=13；(86) 4.27-(1.96-1.73)=4.27-0.23,=4.04；(87) 7.27-(1.98+0.27),=7.27-0.27-1.98,=7-1.98,=5.02；(88) 13.7+8.65-9.628,=22.35-9.628,=12.722；(89) 12.8-(4.38+1.614)=12.8-5.994=6.806(90) 15.17-(3.6+4.9),=15.17-8.5,=6.67；(91) 35.6+

30、(12.6-4.4),=35.6+8.2，=43.8；(92) 16.4+3.5+83.6+166.5=(16.4+83.6)+(3.5+166.5)=100+170=270；(93) 4.65-2.55-1.45,=4.65-(2.55+1.45),=4.65-4,=0.65；(94) 94)1.28+0.86+38.72，=(1.28+38.72)+0.86，=40+0.86，=40.86；(95) 25.74-3.57-6.43,=25.74-(3.57+6.43),=25.74-10,=15.74；(96) 14.5-4.68-5.32,=14.5-(4.68+5.32),=14.51

31、0,=4.5；(97) 0.485+0.64+3.36，=0.485+(0.64+3.36)，=0.485+4，=4.485；(98) 72.51-9.34-12.66,=72.51-(9.34+12.66),=72.51-22,=50.51；(99) 14.02-4.5+0.98,=(14.02+0.98)-4.5,=15-4.5,=10.5；(100) 5.76+2.43+0.24+10.57，=(5.76+0.24)+(2.43+10.57)，=6+13，=19；(101) 9.28-(3.28+2.55),=9.28-3.28-2.55,=6-2.55,=3.45；(102) 9.5+

32、4.85-6.13,=14.35-6.13,=8.22；(103) 10.75-1.86-2.75-3.16,=(10.75-2.75)-(1.86+3.16),=8-5.02,=2.98(104) 104)1.3+0.94+0.06+7.7，=(1.3+7.7)+(0.94+0.06)，=9+1，=10；(105) 105)4.45+0.63+5.55，=(4.45+5.55)+0.63，=10+0.63，=10.63；(106) 45.5-(0.98+5.5),=45.5-0.98-5.5,=(45.5-5.5)-0.98,=40-0.98,=40-(1-0.02),=40-1+0.2,=

33、39.02；(107) 0.96-0.28+0.04-0.72,=(0.96+0.04)-(0.28+0.72),=1-1,=0(108) 12.7+12.5+0.5，=12.7+(12.5+0.5)，=12.7+13，=25.7(109) 0.6+0.94-0.208,=1.54-0.208,=1.332；(110) 27.73(4.73-1.85),=27.73-4.73+1.85,=23+1.85，=24.85；(111) 3.84+26.5-(20-8.6),=3.84+26.5-11.4,=3.84+15.1，=18.94(112) 7.38-5.14+3.62-2.86,=(7.3

34、8+3.62)-(5.14+2.86),=11-8,=3；(113) 5.86+13.08-9.27,=18.94-9.27,=9.67；(114) 25.4-(15.4-6.4),=25.4-15.4+6.4,=10+6.4，=16.4；(115) 47.23-7.235.89,=40-5.89,=34.11(116) 116)4.45+0.63+5.55，=4.45+5.55+0.63，=10+0.63，=10.63；(117) 5.28(2.9+1.28),=5.28-1.28-2.9,=4-2.9,=1.1；(118) 5.25+7.86-2.86+4.75,=(5.25+4.75)+

35、(7.86-2.86),=10+5，=15；(119) 0.96-0.28+0.04-0.72,=(0.96+0.04)-(0.28+0.72),=1-1,=0(120) 120)9.42+7.39+1.58，=(9.42+1.58)+7.39，=11+7.39，=18.39；(121) 18.4-1.6-5.4,=18.4-(1.6+5.4),=18.4-7,=11.4(122) 75.7+39.4-23.86,=115.1-23.86,=91.24；(123) 21.21+38.38-9.79,=59.59-9.79,=49.8；(124) 47.28+1.39+52.72，=47.28+

36、52.72+1.39，=100+1.39，=101.39；(125) 2.45-1.68+1.54,=0.77+1.54，=2.31(126) 15-8.13-1.87,=15-(8.13+1.87),=15-10,=5；(127) 5.14+3.2256.302,=8.365-6.302,=2.063；(128) 3.95+5.36-1.95,=3.95-1.95+5.36,=2+5.36，=7.36；(129) 13.67-(5.45+3.67),=13.67-5.45-3.67,=13.67-3.67-5.45,=10-5.45,=4.55；(130) 4.26+5.48-1.26+4.

37、52,=(4.52+5.48)+(4.26-1.26),=10+3；=13；(131) 14.67+25.91+15.33+4.09，=(14.67+15.33)+(25.91+4.09)，=30+30，=60(132) 10.75-(2.4-0.86),=10.75-1.54,=9.21；(133) 9.61-4.38+0.35,=5.23+0.35，=5.58；(134) 3.87+4.92+1.13，=4.73，(146) 1.8 - 1.57+0.2 ,=1.8+0.2 - 1.57 ,=2- 1.57 ,=0.43(147) 5.03 2.5+0.96 ,=2.53+0.96 ，=3

38、.49；(148) 35.72 - (5.9+5.72 ),=35.72 - 5.9 - 5.72 ,=35.72 - 5.72 - 5.9 ,=30-5.9 ,=24.1 ；(149) 25-4.7+5.3 , =20.3+5.3 ，=25.6；(150) 1.3+2.83+8.7+0.17 ，=(1.3+8.7 ) +(2.83+0.17 ) ，=10+3，=13；(151) 2.47 - 2.2 - 3.8+7.53 , =(2.47+7.53 ) - ( 2.2+2.8 ), =10-5, =5(152) 6.89+4.7+2.11+5.3 ， =(6.89+2.11 ) +(4.7+

39、5.3 ) ， =9+10，=19；(153) 7.46 2.37 - 1.63 ,=7.46 - ( 2.37+1.63 ),=7.46 4,=3.46；(154) 14- (3.65+0.24 ),=14-3.89 ,=10.11 ；(155) 70.8 - 1.25 - 1.75 ,=70.8 - ( 1.25+1.75 ),=70.8 - 3,=67.8；(156) 5.81+8.3+4.19+11.7 ， =(5.81+4.19 ) +(8.3+11.7 )， =10+20，=30；(157) 157) 4.2+7.64+5.8+2.36 ，=(4.2+5.8 ) +(7.64+2.

40、36 ) ，=10+10，=20；=(3.87+1.13)+4.92，=5+4.92，=9.92；(135) 46.24-8.66-1.34,=46.24-(8.66+1.34),=46.24-10,=36.24；(136) 21.9-9.22-0.78+8.1,=21.9-(9.22+0.78)+8.1,=21.9-10+8.1,=11.9+8.1，=20；(137) 35.47+39.88-12.37,=(35.47-12.37)+39.88,=23.1+39.88，=62.98；(138) 93.21-5.99-14.01,=93.21-(5.99+14.01),=93.21-20,=7

41、3.21；(139) 139)15.37+28.94+4.63+1.06，=(15.37+4.63)+(28.94+1.06)，=20+30，=50；(140) 42.37-(12.37-9.78),=42.37-12.37+9.78,=30+9.78，=39.78(141) 38.78-19.59+41.22-30.41,=38.78+41.22-19.59-30.41,=(38.78+41.22)-(19.59+30.41),=80-50,=30；(142) 142)1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1，=(1.9+0.1)+(19.9

42、+0.1)+(199.9+0.1)，=2+20+200，=222；(143) 429+31.1+2.04，=429+(31.1+2.04)，=429+33.14，=462.14，(144) 100-27.2-42.8,=100-(27.2+42.8),=100-70,=30，(145) 9-(3.02+1.25),=9-4.27,(158) 14.28-2.63-7.37,=14.28-(2.63+7.37),=14.28-10,=4.28；(159) 159)6.8+5.26+3.74+3.2，=(6.8+3.2)+(5.26+3.74)，=10+9，=19；(160) 6.21-3.8+2

43、.2,=2.41+2.2，=4.61；(161) 161)6.03+3.7+2.97，=(6.03+2.97)+3.7，=9+3.7，=12.7；(162) 17.43-6.57-2.43,=17.43-(6.57+2.43),=17.43-9,=8.43；(163) 20.47-(1.47+6.8),=20.47-1.47-6.8,=19-6.8,=12.2；(164) 164)13.26+4.71+3.47+5.29，=(13.26+3.47)+(4.71+5.29)，=16.73+10，=26.73；(165) 22.74+8.68-13.74,=(22.74-13.74)+8.68,=

44、9+8.68，=17.68(166) 12.56-6.64-3.36,=12.56-(6.64+3.36),=12.56-10,=2.56；(167) 45.5-(0.98+5.5),=45.5-0.98-5.5,=45.5-5.5-0.98,=40-0.98,=39.02；(168) 168)13.6+7.94+6.4，=(13.6+6.4)+7.94，=20+7.94，=27.94；(169) 169)15.19+3.36+4.64+4.81，=(15.19+4.81)+(3.36+4.64)，=20+8，=28(170) 170)4.7+7.69+5.3+2.31，=(4.7+5.3)+

45、(7.69+2.31)，=10+10，=20(171) 53.78-13.6-37.4+6.22,=(53.78+6.22)-(13.6+37.4),=60-51,=9(172) 60-(21.5-8.8)+7.3,=60-12.7+7.3,=47.3+7.3，=54.6(173) 9.5+4.856.13,=14.35-6.13,=8.22；(174) 75.8-(15.3-4.8),=75.8-10.5,=65.3；(175) 51.27-8.66-1.34,=51.27-(8.66+1.34),=51.27-10,=41.27；(176) 28.4-3.96-1.04+4.6,=(28.

46、4+4.6)-(3.96+1.04),=33-5,=28；(177) 70.87.251.75=70.8-(7.25+1.75),=70.8-9,=61.8；(178) 5.81+8.3+4.19+11.7=(5.81+4.19)+(8.3+1.7)，=10+10，=20；(179) 794-198,=794-(200-2),=794-200+2,=594+2，=596；(180) 6756-193-207,=6756-(193+207),=6756-400,=6356；(181) 0.9+1.08+0.92+0.1，=(0.9+0.1)+(1.08+0.92)，=1+2，=3；(182) 1

47、3.59-6.91-0.09,=13.59-(6.91+0.09),=13.59-7,=6.59(183) 183)4.58+3.38+(5.48+6.62)=4.58+5.48+(3.38+6.62)，=10.06+10，=20.06；(184) 73.75-(4.3+8.75)=73.75-8.75-4.3,=65-4.3,=60.7；(185) 5-(4.19-2.83),=5-1.36,=3.64；(186) 186)1.39+0.72+0.61+3.28，=(1.39+0.61)+(0.72+3.28)，=2+4，=6；(187) 8-3.7-6.3,=8-(3.7+6.3),=8-

48、10,=-2;(188) 8.28-(1.28+3.7),=8.28-1.28-3.7,=7-3.7,=3.3(189) 15.37-7.59+5.73-12.41,=(15.37+5.73)-(7.59+12.41),=21-20,=1；(190) 11.72-7.85-(1.26+0.46),=11.72-7.85-1.72,=11.72-1.72-7.85,=10-7.85,=2.15(191) 191)15.37+28.44+12.56，=15.37+(28.44+12.56)，=15.37+41，=56.37；(192) 12.64-(3.96+4.64),=12.64-3.96-4.64,=12.64-4.64-3.96,=8-3.96,=4.04；(193) 36.26-4.78+3.74,=36.26+3.74-4.78,=40-4.78,=35.22；(194) 7.34+7.57+12.66+6.43，=(7.34+12.66)+(7.57+6.43)，=20+14，=34；(195) 78.65-23.12-14.88,=78.65-(23.12+14.88),=78.65-38,=40.65(195)4.58+2.39+(5.42+7.61)，=(4.58+5.42)+(2.39+7.61)，=10+1