復(fù)雜方程計(jì)算專(zhuān)項(xiàng)練習(xí)91題有答案

1、小學(xué)復(fù)雜方程專(zhuān)項(xiàng)練習(xí)91題（有答案）(1)2x+5=5x-7,(6)X+(3X-16)-4=104(X+1),Jx+1=lx+3,22(8) 6(3x2)-4(4x-3)=1-8x,(4)5+(X+16.81)=-,(9) 4(x2)+20x4=5(12x),(2)3(x2)=2-5(x2),(10)1.6+(x0.45)=5,(5)0.2x+,=8-1-x,55第1頁(yè)共1頁(yè)(16)2(x+2)-3=3x-5,(11)35(x2)15(5x6)=(22x63)21(3x4),(12)x勺5+0.4=xT20.1,(17) x+(3x-16)及5%=10(x+1),(13)150.5-4x=7-

2、0.5x(18) A-1.4=3.6+Zx,43(14)，x-2至=0.25-工,7112S(19)(15)5X+7.25=12-2.5X,4(20)2x-=8+x,3第2頁(yè)共2頁(yè)(21)8(x-2)=2x+7,(26) (X+12)些=42-X,5(22)6(x3.5)=17.8+2x,(27) 2-1-(X-0.55)=笆,77(23)5+(x+16.84)=0.2,(28) 7X(x+6)-3x=4X(2x+5),(24)(9+R:(9-X)=5:3,(29)_=2.5,(25)x+(3xT6)e5%=10(x+2),(30)60+(x+10)=5第3頁(yè)共3頁(yè)(31)金(28-2x)=6

3、(x5)s(37)3(x+2)=4(x+1),(32)64+(2x-5)=32(38) -(x+2)=x+14(34)l2+(x-45%)=2.8,5(39) 76(x-2)=52x-32(35)5(X+4)=26.6X,(40) 81x-342=76(x-2)(36)100>0.5+(x-100)X0.4=0.48x(41) 3(2-x)+5(4x-3)=4(x+1)第4頁(yè)共4頁(yè)(42)15-(5.5x)=2x(47)30%x+85=70%x+25,(43)16+x=12+2x+x(48)8.5M.25.3x=8.54x(44)2(x4)=3(x12)(49)5x-2(32x)=16x

4、-23(45)0.4+(4x)=1%(50)(x5)>5-9=(x12)M2(46)8(x-2)=2(x+7),(51)(10x)2=5x-7第5頁(yè)共5頁(yè)(52)2.7x-1.8=1.2x+2.7,(57)3.5L5(53)8-5(6x+0.7)=10x+0.5,(58)X+(3X-16)及5%=10(X+1)(59)75+(x+10)=2,(54) 8.5x-3.9x=55.2(x-18),(55) 122-x-19=(x19)X5,(60) 5x-3X(28x)=12+2x,(56)3.5x+2=4x-1,(61)6(x+1)=0.5(10x+16),第6頁(yè)共6頁(yè)(62)5(x+2)

5、=4(x+9),(67)4x-2(5.5x)=3.5x-8,(63)127.5+(2x+3)=15,(68)2.8x=19.32-6.4x,(64)3(x+2)=4(x+1),(69)5(y-4)-7(7-y)9=12-3(9-y),(65)8(x1.5)=x+0.6,(70)35(x2)-15(5x6)=22x-63-21(3x4),(66)7(x+6)-3x=4(2x+5),(71)2.6x=51.6-3.4x,第7頁(yè)共7頁(yè)(77)(0.6x+420)+(x+20)=3,(72)3(4x2)-2(3x+3)=9-8x,(73)20+4x=6x-24,(78)35(2-x)+15(6-5x)

6、=22x+7+213x),(74)5(xT)=x+1,(79)5(3x4)2(xT)=5(2xT)(80)x=4.9+-ix,35(75)3(3x2)=10-0.5(x3.5),(76)0.4(x0.2)+1.5=0.7x-0.38,(81)3x+5l=2x+e也,443第8頁(yè)共8頁(yè)(82)X32=(18x)與,(87) (9+21)x=66x由0-40-440,(83)4(4x-6)=5(3x+1),(88) x-2.5=(x1.8)>2(84)10X=3(2X+17)+45,(89) 12+(x-12)X+-x=x52(85)5.7(X0.2)=5.1(X+0.6)+4,(90) 3

7、(X3)+4(3X2)=7(2X),(86)(3x+4)+x=7(x-5)(91)3X-22X+33X+2第9頁(yè)共9頁(yè)小學(xué)復(fù)雜方程專(zhuān)91題參考答案:(1) 2x+5=5x-7,2x+5-2x=5x-72x,3x-7=5,3x-7+7=5+7,3x=12,3x3=12與,x=4;(2) 3(x-2)=25(x-2),3x-6=125x,3x-6+5x=125x+5x,8x-6=12,8x-6+6=12+6,8x=18,8x8=188,x=2.25;v+22y-3(3) 上三-=1,46y+22y-3(2Z±-_)X24=1K4,466(y+2)-4(2y3)=24,30-2y=24,3

8、0-2y+2y=24+2y,2y+24=30,2y+2424=3024,2y=6,2y受二6及，y=3(4) 5-(X+16.81)=-,55-(X+16.81)X(X+16.81)=-X(X+16.81),51-x(X+16.81)=5,5Y><(X+16,81)>5=5X5,5X+16.81=25,X+16.8116.81=2516.81,x=8.1941.8x+-=8,54441.8x+-=8-,5551.8x=7.2,1.8xT.8=7.2T.8,x=4(6)X+(3X-16)-t1=10(X+1),4X+(3X-16)X4=10X+10,X+12X64=10X+10

9、,13X64=10X+10,13X-64+64=10X+10+64,13X=10X+74,13X-10X=10X+7410X,3X=74,3X石=74-e,31(7)-x+1=-x+3,2 23 .11o1x+1x=x+32222x+1=3,x+11=3-1,x=2(8)6(3x-2)-4(4x3)=18x,18x-1216x+12=18x,18x16x+8x=0,10x=1,x=1TO,1X-To;(9)4(x-2)+20x4=5(12x),4x-8+20x-4=510x,24x+10x=5+12,34x=17,x=1734,1x=2;(10)1.6-(x-0.45)=5,X-0.45=1.

10、65,X-0.45=0.32,x=0.32+0.45,x=0.77;第10頁(yè)共10頁(yè)2x+43=3x5,2x+1+5=3x5+5,2x+6=3x,x+20=21,X+20-20=2120,2x+62x=3x2x,x=6.x=1(17)x+(3x16)及5%=10(x+1),(11)35(x2)15(5x6)=(22x63)21(3x4),35x7075x+90=22x6363x+84,35x7075x+90-22x+63x=22x63-63x+84-22x+63xx+12x64=10x+10,(12)xT5+0.4=xT20.1,x+0.4=x151213x64=10x+10,13x6410x

11、=10x+1010x,x+0.4x=x1515120.1x,153x64+64=10+64,3x與=74與,(13)0.4+0.1=x0.1+0.1,600.5>60=x>60,60x=30;150.54x=7-0.5x150.54x+0.5x=7-0.5x+0.5x150.53.5x=7,150.53.5x+3.5x=7+3.5x,150.57=7+3.5x7,(18)x=3cc2士x1.4=3.6+Wx,221.4-=x=3.6+-x；x'x1.4=3.6,121x121.4+1.4=3.6+1.4143.54.5=3.5x65,x=41(14)-x72=0.2511一

12、x12=5m工1212x=60,2151k0.25x2352=0.25,11(19)1.2:17-x23552+2=0.25+21111If(15)Hx2S2_x=1.2X5,32c之6,x=4112；xx=95X+7.25=12-2.5X,45X+7.25+2.5X=1212.5X+2.5X,(20)i=8+x,37.5X+7.25=125x2=24+3x,7.5X+7.257.25=12-7.25,5x23x=24+3x3x,2x2=24,7.5X=5,7.5X45=58.5,2x=-.(16)2(x+2)3=3x5,2x2+2=24+2,2x=26,2x妥=26受，x=13(21)8(x

13、2)=2x+7,第11頁(yè)共11頁(yè)8x16+16=2x+7+16,8x=2x+23,8x2x=2x+232x,6x=23,6x與=23與，x=3二x=36(22)6(x3.5)=17.8+2x,6x21=17.8+2x,6x212x=17.8+2x2x,4x21+21=17.8+21,4xF=38.8%x=9.7;_2x=1S6x,色x=*X+XX-'X=55X=18§.7，(27)21-(X0.55)7=322一(X0.55)X(X0.55)=X(X0.55),77(23) 5+(x+16.84)=0.2,5+(x+16.84)X(x+16.84)=0.2X(x+16.84)

14、,5=0.2x+3.368,53.368=0.2x+3.3683.368,1.632£2=0.2x包2,x=8.16;(24) (9+X):(9R=5:3,3(9+X)=5(9X),3>9+3X=5X95X,27+3X=455X,3X+5X=4527,8X=18,8X3=183,X=2.25;X(X0.55)上,7732X(X0.55)32732X0.55=1532'X0.55+0.55=0.46875+0.55,X=1.01875;(28)7X(x+6)3x=4X(2x+5),7x+423x=8x+20,42+4x=8x+204x+20=42,4x+2020=424x

15、=22,4xM=2220,(25)x+(3x16)及5%=10(x+2),x=5.5;x+(3x16)1”一-=10x+10>2,4(29)153K+5=2.5,x+(3x16)M=10x+20,x+3xM16M=10x+20,x+12x64=10x+20,x+12x10x=20+64,3x=84,3x右=84與，x=282、，(26)(X+12)=42X,515=2.5X(3x+5),7.5x+12.5=15,7.5x+12.512.5=1512.5,7.5x=2.5,7.5x7.5=2.5寸.5,1'=；(30)60+(x+10)=560+(x+10)X(x+10)=5(x+

16、10)5x+50=605x+5050=60505x=105x芍=10芍224X+24=42Xx=23(31)彳(28-2x)=6(x-5)第12頁(yè)共12頁(yè)第13頁(yè)共13頁(yè)213x=6x3024+30=6x+二x24'x=x=4227x427227x=6(32) 64+(2x5)=3264+(2x5)X(2x5)=32X(2x5)64x=160+6464x=22464x與4=224也4x=3.5(33) 81x342=76X(x2)81x342=76改15281x76x=3421525x=1905x芍=190與x=38(34) 1=一(x45%)=2.8,51.4+(x0.45)=2.8

17、,x0.45=1.428,x0.45=0.5,x0.45+0.45=0.5+0.45,x=0.95(35) 5(X+4)=26.6X,5x+20+x=26.,6x+x,6x+2020=26.620,6xV=6.6W,(36) 100X0.5+(x100)>0.4=0.48x0.4x+10=0.48x0.4x+100.4x=0.48x0.4x0.08x=100.08x4.08=104.08x=125.(37) 3(x+2)=4(x+1),3x+6=4x+4,3x+63x=4x+43x,x+4=6,x+44=64,x=23(38) (x+2)=x+1433_x+=x+142且x+W=x+1，

18、x=xx=x4x=xx=0；=0+：x='一x42>4=>42x=2(39) 76(x2)=52x3276x152=52x3276x152+152=52x32+15276x=52x+12076x52x=52x+12052x24x=12024x及4=120電4x=5.(40) 81x342=76(x2)81x342=76x152,81x342+342=76x152+342,81x=76x+19081x76x=76x+19076x5x=1905xe=190與x=38(41) 3(2x)+5(4x3)=4(x+1)63x+20x15=4x+417x9=4x+417x4x+99=4

19、x4x+4+913x=1313x13=13T3x=1;(42) 15(5.5x)=2x155.5+x=2x2xx=9.5x=9.5;(43) 16+x=12+2x+x16+x=12+3x3xx=16122x=4xe=4受x=2(44) 2(x4)=3(x12)2x8=3x362x82x=3x2x368=x368+36=x36+36x=28;(45) 0.4+(4x)=1F=C4-k)41.6=4x1.6+x=4x+x1.6+x=41.6+x1.6=41.6x=2.4;(46) 8(x2)=2(x+7),8x16=2x+14,8x162x=2x+142x,6x16+16=14+16,6x與=30

20、與，x=5(47) 30%x+85=70%x+25,0.3x+850.3x=0.7x+250.3x,0.4x+25=85,0.4x+2525=8525,0.4x=60,0.4x0.4=60阻4,x=150;(48) 8.5X1.25.3x=8.54x10.25.3x=8.54x10.25.3x+5.3x8.5=8.54x+5.3x8.51.3x=1.71.3x勺.3=1.7T.317(49) 5x2(32x)=16x235x6+4x=16x239x6=16x239x69x+23=16x239x+237x=177x寸=178x=廠x=7(50) (x5)X59=(x12)M25x259=12x1

21、445x34=12x1445x345x+144=12x1445x+1447x=1107x寸=110勺110x=7(51) (10x)受=5x710x=10x1410x+x+14=10x14+x+1411x=2411x-11=24-11x=2411(52) 2.7x1.8=1.2x+2.7,2.7x1.8+1.8=1.2x+2.7+1.8,2.7x1.2x=1.2x+4.51.2x,1.5x勺.5=4.5T.5,x=3;(53) 85(6x+0.7)=10x+0.5,830x3.5=10x+0.5,4.530x+30x=10x+0.5+30x,4.50.5=40x0.5,4-40=40x/0,x

22、=0.1;(54)8.5x3.9x=55.2(x18),4.6x=55.2x993.6,4.6x4.6x=55.2x993.64.6x,50.6x993.6=0,50.6x993.6+993.6=993.6,50.6x=993.6,50.6x芍0.6=993.640.6,x=19.63;(55) 122x19=(x19)>5,103x=5x95,103x+x=5x95+x,103+95=6x95+95,1986=6x6,x=33;第14頁(yè)共14頁(yè)(56) 3.5x+2=4x1,3.5x+23.5x=4x13.5x,2+1=0.5x1+1,3包5=0.5x阻5,x=6(57)'=-

23、I'3.51.53.5(X16)=1.5X,3.5X56=1.5X3.5X56+56=1.5X+563.5X1.5X=562X=56X=28,(58) X+(3X16)受5%=10(X+1)X+(3X16)M=10X+10X+3X44-16>4=10X+1013X64=10X+1013X64+64=10X+10+6413X=10X+7413X10X=10X+7410X3X=74(59) 75+(x+10)=2,75+(x+10)X(x+10)=2X(x+10),2x+20=75,2x+2020=7520,2x=55,2x及=55受，x=27.5;(60) 5x3X(28x)=12

24、+2x,8x84=12+2x,8x84+84=12+2x+84,8x=96+2x,8x2x=96+2x2x,6x=96,6x4=96%x=16(61)6(x+1)=0.5(10x+16),6x+6=5x+8,6x+66=5x+86,6x5x=5x+25x,x=25x+10=4x+36,5x4x=3610,x=26;(63) 127.5+(2x+3)=15,127.5+(2x+3)X(2x+3)=15X(2x+3),15X(2x+3)=127.5,15X(2x+3)-15=127.5T5,2x+3=8.5,2x+33=8.53,2x=5.5,2x=5.52x=2.75;(64) 3(x+2)=4

25、(x+1),3x+6=4x+4,3x+63x=4x+43x,x+4=6,x+44=64,x=2;(65) 8(x1.5)=x+0.6,8x12=x+0.6,8x12+12=x+0.6+12,8x=x+12.6,8xx=x+12.6x,7x=12.6,7x寸=12.6之，x=1.8;(66) 7(x+6)3x=4(2x+5),7x+423x=8x+20,4x+42=8x+20,4x+424x=8x+204x,4x+20=42,4x+2020=4220,4x=22,4x44=224,x=5.5;(67) 4x2(5.5x)=3.5x8,4x11+2x=3.5x8,6x11=3.5x8,6x11+1

26、1=3.5x8+11,3.5x+3=6x,3.5x+33.5x=6x3.5x,2.5x=3,(62)5(x+2)=4(x+9),2.5x5=325,x=1.2第15頁(yè)共15頁(yè)(68) 2.8x=19,326.4x,2.8x+6.4x=19,326.4x+6.4x,9.2x=19.32,9.2x9.2=19.32兇.2,x=2.1;(69) 5(y4)7(7y)9=123(9y),5y2049+7y9=1227+3y,12y78=3y15,12y78+78=3y15+78,12y3y=3y+633y,9y=63,9y令63y=7(70) 35(x2)15(5x6)=22x6321(3x4),35

27、x7075x+90=22x6363x+84,35x75x22x+63x=63+8490+70,x=1(71) 2.6x=51.63.4x,2.6x+3.4x=51.63.4x+3.4x,6x=51.6,6x與=51.6",x=8.6;(72) 3(4x2)2(3x+3)=98x,6x12=98x,6x12+8x=98x+8x,14x12=9,14x12+12=9+12,14x=21,14xT4=21T4,x=1.5;(73) 20+4x=6x24,20+4x4x=6x244x,2x24=20,2x24+24=20+24,2x=44,2x右=44右，x=22;(74) 5(x1)=x+

28、1,5x5=x+1,5x5x=x+1x,4x5=1,4x5+5=1+5,4x=6,4x-4=6-4,x=1.5;(75) 3(3x2)=100.5(x3.5),9x6=11.750.5x,9x6+0.5x=11.750.5x+0.5x,9.5x6=11.75,9.5x6+6=11.75+6,9.5x=17.75,9.5x25=17.754.5,47x=；38(76) 0.4(x0.2)+1.5=0.7x0.38,0.4x+1.42=0.7x0.38,0.4x+1.420.4x=0.7x0.380.4x,0.3x0.38=1.42,0.3x0.38+0.38=1.42+0.38,0.3x=1.8

29、,0.3x£3=1.8F.3,x=6;(77) (0.6x+420)+(x+20)=3,(0.6x+420)+(x+20)X(x+20)=3X(x+20),3(x+20)=0.6x+420,3x+60=0.6x+420,3x+600.6x=0.6x+4200.6x,2.4x+60=420,2.4x+6060=42060,2.4x=360,2.4x2.4=3602.4,x=150;(78) 35(2x)+15(65x)=22x+7+21(43x),160110x=9141x,160110x+110x=9141x+110x,69x+91=160,69x+9191=16091,69x=69,69x69=6969,x=1(79) 5(3x4)2(x1)=5(2x1)15x202x+2=10x5,13x18=10x5,13x1810x=10x510x,3x18=5,3x18+18=5+18,3x=13,第16頁(yè)共16頁(yè)(80)gx=4.9+_l