復(fù)雜方程計(jì)算專項(xiàng)練習(xí)91題(有問題詳解)

1、實(shí)用文檔小學(xué)復(fù)雜方程專項(xiàng)練習(xí)91題(有答案)(1) 2x+5=5x-7,(6 ) X+ (3X-16) 4=10 (X+1),(7 ) 2x+1=4x+3 ,22'4(2) 3 (x2) =2-5 (x2),文案大全券卷=1,(8 ) 6 (3x - 2) - 4 (4x- 3) =1 -8x,(4)5+ (X+16.81 )=-,(9 ) 4 (x-2) +20x - 4=5 (1-2x),(5)40.2x+-=8-5(10 ) 1.6+ (x 0.45 ) =5,(11)35 (x 2)15 (5x 6) = (22x 63)21 (3x 4),(16 )2 (x+2) - 3=3

2、x-5,(12 )x 勺5+0.4=xT2 0.1 ,(17 )x+ (3x - 16 )及5%=10 (x+1 ),(13 )150.5 4x=7-0.5x(18 )3 c八2-x- 1.4=3.6+-x,43(14 )，x - 2巨=0.25 - Ax,711 2S(19 )(15 )5X+7.25=12 - 2.5X,4(20 )2x - -=8+x,3(21) 8 (x-2) =2x+7,(26 ) (X+12)避=42-X,5(22 )6 (x 3.5 ) =17.8+2x,(27 )是+ (X- 0 . 55)=第,77(23 )5+ (x+16.84) =0.2,(28 ) 7X

3、 (x+6) - 3x=4 X (2x+5),(29 ) 12_=2.5,3 K+5(30 )60+ (x+10) =5(24 ) (9+R : (9- X)=5： 3,(25 ) x+ (3x- 16 )e5%=10 (x+2),(37 ) 3 (x+2) =4 (x+1),(31)2(28- 2x ) =6 (x- 5 ) s(32 )64+ (2x-5) =32(38 )衛(wèi)(x+2) =x+14(34 ) 1- (x- 45%) =2.8,5(39 ) 76 (x- 2) =52x -32(35 ) 5 (X+4 ) =26.6 X,(40 ) 81x- 342=76 (x-2)(36

4、) 100>0.5+ (x- 100) X0.4=0.48x(41) 3 (2-x) +5 (4x-3 ) =4 (x+1)(42 ) 15- (5.5 x) =2x(47 ) 30%x+85=70%x+25 ,(43) 16+x=12+2x+x(48 ) 8.5M.2 5.3x=8.5 4x(44 ) 2 (x4 ) =3 (x 12)(49 ) 5x- 2 (3 2x ) =16x- 23(45 ) 0.4+ (4 x) =1 %(50 ) (x 5) >5-9= (x 12) M2(46 ) 8 (x- 2) =2 (x+7),(51) (10 x)及=5x 7(57=

5、9;'3.5 1.5(52 ) 2.7xT.8=1.2x+2.7 ,(53 ) 85 (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= (x 19 ) X5,(60 ) 5x- 3X (28 x ) =12+2x ,(56) 3.5x+2=4xT,(61) 6 (x+1 ) =0.5 (10x+16),(62) 5 (x+2) =4 (x+9),(67 ) 4x- 2 (5.5x) =3.5x - 8,(63)

6、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 (x 1.5) =x+0.6 ,(70 ) 35 (x 2) - 15 (5x 6) =22x - 63- 21 (3x 4),(66 ) 7 (x+6) - 3x=4 (2x+5),(71) 2.6x=51.6 - 3.4x,(72 ) 3 (4x 2) - 2 (3x+3) =9 8x,(77 ) (0.6x+420) + (x+20) =3,(73 ) 20+4x=6

7、x - 24,(78 ) 35 (2-x) +15 (6- 5x ) =22x+7+213x ),(74 ) 5 ( x 1) =x+1 ,(79 ) 5 (3x 4) 2 (x1) =5 (2xT)(75 ) 3(3x2) =10- 0.5 (x 3.5),(80 ) x=4.9+-ix,35(76 ) 0.4 (x 0.2) +1.5=0.7x -0.38,(81) 3x+5>i=2x+->,44 3(82 ) X32= (18 x)與,(87 ) (9+21 ) x=66x 由0- 40 - 440,(83 ) 4 (4x- 6) =5 (3x+1 ),(88 ) x- 2.

8、5= (x 1.8) >2(84 ) 10X=3 (2X+17) +45,(89 ) 12+ (x-12 ) X +- x=x5 2(85 ) 5.7 (X 0.2 ) =5.1 (X+0.6) +4,(90 ) 3 (X 3 ) +4 (3X 2) =7 (2 X),(86 ) (3x+4) +x=7 (x-5)(91)3X-2強(qiáng)=”2.46實(shí)用文檔(16) 2 (x+2)3=3x 5,文案大全小學(xué)復(fù)雜方程專91題參考答案:，c 4 c1.8x+=8 ,5(1) 2x+5=5x7 ,2x+5 2x=5x 7 2x,4441.8x+- -=85553x 7=5 ,1.8x=7.2 ,3x

9、 7+7=5+7 ,3x=12 ,1.8xT.8=7.2 T.8x=43x3=12 與，(6)X+ (3X 16)x=4; 3 (x 2) =2 5 (x 2),3=10 (X+1 ),4(3)X+ (3X 16)M=10X+10 ,3x 6=12 5x,3x 6+5x=125x+5x ,8x 6=12,8x 6+6=12+6 ,8x=18 ,8xY=18 ®x=2.25 ;X+12X64=10X+10 ,13X 64=10X+10 ,13X 64+64=10X+10+64 ,13X=10X+74 ,13X10X=10X+7410X,3X=74 ,3X右=74與，X.T4X=3(7)

10、上 x+1 =3x+3 ,)>24=1 X24,6 (y+2)4 (2y 3) =24 ,30 2y=24 ,30 2y+2y=24+2y ,x+12x+1=3 ,x+15 + (X+16.812y+24=30 ,2y+24 24=30 24,2y=6,2y及=6父,y=35+ (X+16.81 )X (X+16.81 )7X (X+16.81 )5(8) 6x=2(3x 2)4 (4x 3) =1 8x,18x 1216x+12=1 8x,18x 16x+8x=0 ,10x=1 ,x=1 T0,1=-X (X+16.81 ),5x=w;=5,(9) 4(x 2) +20x 4=5 (1

11、 2x),1-x (X+16.81) >5=5X5,54x 8+20x 4=5 10x,24x+10x=5+12 ,34x=17 ,X+16.81=25 ,X+16.8116.81=25 16.81 ,x=8.19x=17 與4,1小,、4(5) 0.2x+J50.2x+ +x=85 5(10) 1.6 + (x 0.45) =5,x 0.45=1.6 芍,x 0.45=0.32 ,x=0.32+0.45 , x=0.77 ;2x+4 3=3x 5,2x+1+5=3x5+5,2x+6=3x ,x+20=21 ,X+20-20 =2120,2x+6 2x=3x 2x,x=6 .x=1(17

12、)x+ (3x 16) 及5%=10 (x+1 ),(12) xT5+0.4=x T2 0.1 ,x+12x 64=10x+10 ,x+0.4= x 0.1 ,151213x 64=10x+10 ,13x 64 10x=10x+1010x,-x+0.4-x= -x 0.1 x,1515 12153x 64+64=10+64 ,3x與=74與,(13)0.4+0.1 = x 0.1+0.1 ,600.5 >60=-x>60,60x=30 ;150.5 4x=7-0.5x150.5 4x+0.5x=7-0.5x+0.5x150.5 3.5x=7 ,150.53.5x+3.5x=7+3.

13、5x ,150.5 7=7+3.5x 7,143.54.5=3.5x65,x=41(18)(14) -x72-L=0.2511451: x 2-+ x=0.25711 281 . 1"x+ 廿.2g 2SX，x=32-x 1.4=3.6+±x,432221.4 -x=3.6+-x -x,33312x 1.4=3.6,x 1.4+1.4=3.6+1.412x=5 ,1217-x23K - 5 2gx 2 11'552一+2一=0.25+211 11If旦單=2逛單,23 17 44 17(19)1 l：x1.2:. 5 .I： 5 1 I：x=60 ,2 -x=1.2

14、 >5, 3-x=6 ,3(11 ) 35 (x 2)15 (5x 6) = (22x 63)21 (3x 4),35x 70 75x+90=22x 63 63x+84,35x 70 75x+90-22x+63x=22x63-63x+84-22x+63xx=9x=411(15)5X+7.25=12 - 2.5X,4(20)5X+7.25+2.5X=12 2.5X+2.5X ,42k-旁=8+x,7.5X+7.25=12M= (8+x)35x 2=24+3x ,7.5X+7.257.25=12、7.25,5x 2 3x=24+3x 3x,2x 2=24,7.5X=5 ,7.5X45=5 8

15、.5,2 x=.-.12x 2+2=24+2 ,2x=26 ,2x妥=26受，x=13(21)8(x2) =2x+7,8x 16+16=2x+7+16 ,8x=2x+23 ,8x 2x=2x+23 2x,6x=23 ,6x與=23與，x=3 二 x=36(22)6 (x 3.5) =17.8+2x ,6x 21=17.8+2x ,6x 21 2x=17.8+2x 2x,4x 21+21 = 17.8+21 ,4xF=38.8%x=9.7 ;X- X= ,551x點(diǎn)=&25 7 5 7v_186一(27) 21-(X 0 . 55)=第, 771 ,322- (X 0 . 55) X (

16、X 0.55) =X (X 0.55),77(23) 5+ (x+16.84) =0.2,5 + (x+16.84) X (x+16.84 ) =0.2 X (x+16.84 ), 5=0.2x+3.368 ,5 3.368=0.2x+3.3683.368,1.632 £2=0.2x 包2,x=8.16 ;(24) (9+X): (9 R =5: 3,3 (9+X) =5 (9 X),3>9+3X=5 X9 5X ,27+3X=45 5X,3X+5X=4527,8X=18 ,8X 3=18 3,X=2.25 ;X (X 0.55)上,77專 X(X 0.55)X 0.55=32

17、X 0.55+0.55=0.46875+0.55 , X=1.01875 ;(25)x+ (3x16) 及5%=10 (x+2),x+ (3x16)=10x+10 凌，4x+ (3x 16) M=10x+20 ,x+3x M 16M=10x+20 ,x+12x64=10x+20 ,x+12x10x=20+64 ,3x=84 ,3x右=84與,(26)x=28,、，、2、，(X+12) =42 X,52 X+12X,2 24-X+ =42 X ,552 24 2424zX+ -=42 X -,5555(28) 7X (x+6)3x=4 X ( 2x+5 ),7x+42 3x=8x+20 ,42+

18、4x=8x+20 ,4x+20=42 ,4x+20 20=42 20,4x=22 ,4x-4=22 -4,x=5.5 ;(29) I=2.5 3x+515=2.5 X (3x+5), 7.5x+12.5=15 ,7.5x+12.512.5=15 12.5,7.5x=2.5 ,7.5x7.5=2.5 寸.5, 1 x=；(30)60+(x+10) =560+(x+10) X (x+10) =5 (x+10) 5x+50=605x+50 50=60 505x=105x-5=10 -5x=2(31)上(28 2x) =6 (x 5)3實(shí)用文檔21 J?x=6x 302 4213+30=6x+ -x2

19、4'x= 一x=4227x4 27 2 27x=6(32) 64+(2x 5) =3264 + (2x 5) X ( 2x 5) =32 X (2x 5) 64x=160+64 64x=22464x 與4=224 也4 x=3.5(33) 81x 342=76 X(x 2)81x 342=76 改 15281x 76x=3421525x=1905x芍=190與 x=38(34) 12+ (x 45%) =2.8,51.4+ (x 0.45) =2.8, x 0.45=1.4 28, x 0.45=0.5 , x 0.45+0.45=0.5+0.45 , x=0.95(35) 5 (X+

20、4 ) =26.6 X, 5x+20+x=26 ., 6 x+x , 6x+20 20=26.6 20, 6xV=6.6W,(36) 100X0.5+ (x 100) >0.4=0.48x 0.4x+10=0.48x 0.4x+10 0.4x=0.48x0.4x0.08x=100.08x4.08=10 4.08 x=125 .(37) 3 (x+2) =4 (x+1 ), 3x+6=4x+4 , 3x+6 3x=4x+4 3x, x+4=6 , x+4 4=6 4, x=23(38)上(x+2) =x+1433x+ =x+14 2"=x+1，x=xx=x4x=x -x -=0x

21、 +=0+ 1 _1-x4 2>4=->42x=2(39) 76 (x 2) =52x 3276x 152=52x 3276x 152+152=52x32+15276x=52x+12076x 52x=52x+12052x24x=12024x 及4=120 電4x=5 .(40) 81x 342=76 (x 2)81x 342=76x152,81x 342+342=76x152+342,81x=76x+19081x 76x=76x+19076x5x=1905xe=190與x=38(41) 3 (2 x) +5 (4x 3) =4 (x+1)6 3x+20x15=4x+417x 9=4

22、x+417x 4x+9 9=4x 4x+4+913x=1313x13=13 T3x=1 ;(42) 15( 5.5 x) =2x15 5.5+x=2x2x x=9.5 x=9.5 ;16+x=12+3x3x x=16122x=4x -2=4 -2 x=2(44) 2 (x 4) =3 (x 12)2x 8=3x 362x 8 2x=3x 2x 368=x 368+36=x 36+36x=28 ;(45) 0.4+ (4 x) =1 F = C4 - k) 41.6=4 x1.6+x=4 x+x1.6+x=4 1.6+x1.6=4 1.6x=2.4 ;(46) 8 (x 2) =2 (x+7),

23、 8x 16=2x+14 , 8x 16 2x=2x+14 2x, 6x 16+16=14+16 , 6x與=30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=85 25,0.4x=60 ,0.4x 0.4=60 阻4, x=150 ;(48) 8.5X1.2 5.3x=8.5 4x10.2 5.3x=8.54x10.2 5.3x+5.3x8.5=8.5 4x+5.3x8.51.3x=1.71.3x 勺.3=1.7T.317x=廠 x=7(50) (x 5) X5 9= (x 12) M25x

24、25 9=12x1445x 34=12x 1445x 34 5x+144=12x144 5x+1447x=1107x寸=110勺110x=7(51) (10 x)受=5x 710 x=10x1410 x+x+14=10x14+x+1411x=2411x-11=24-1124x=一11(52) 2.7x 1.8=1.2x+2.7 ,2.7x 1.8+1.8=1.2x+2.7+1.8 ,2.7x 1.2x=1.2x+4.51.2x,1.5x 勺.5=4.5T.5, x=3 ;(53) 8 5 (6x+0.7) =10x+0.5 ,8 30x 3.5=10x+0.5 ,4.5 30x+30x=10x

25、+0.5+30x ,4.5 0.5=40x 0.5,4-40=40x /0,x=0.1 ;(54) 8.5x 3.9x=55.2 (x 18),4.6x=55.2x993.6,4.6x 4.6x=55.2x993.6 4.6x,50.6x 993.6=0 ,50.6x 993.6+993.6=993.6 ,50.6x=993.6 ,(49) 5x 2 (3 2x) =16x 235x 6+4x=16x239x 6=16x 239x 6 9x+23=16x23 9x+237x=177x寸=178(55) 122 x 19= (x 19) >5, 103 x=5x 95,103 x+x=5x

26、 95+x, 103+95=6x95+95 ,1986=6x6,x=33 ;50.6x 芍0.6=993.6 40.6, x=19. 63;(56) 3.5x+2=4x1,文案大全實(shí)用文檔3.5x+23.5x=4x 13.5x,2+1=0.5x1+1 ,3 包5=0.5x 阻5,x=6(57)_JL=k-163. 5 1. 53.5 (X 16) =1.5X ,3.5X 56=1.5X3.5X 56+56=1.5X+563.5X1.5X=562X=56X=28 ,(58) X+ (3X 16)受5%=10 (X+1 ) X+ (3X 16) M=10X+10 X+3X 44- 16>4=

27、10X+1013X 64=10X+1013X 64+64=10X+10+6413X=10X+7413X10X=10X+7410X3X=74X3(59) 75+(x+10) =2 ,75 + (x+10) X (x+10) =2 X (x+10), 2x+20=75 , 2x+2020=75 20,2x=55 ,2x及=55受，x=27.5 ;(60) 5x 3X (28 x) =12+2x , 8x 84=12+2x , 8x 84+84=12+2x+84 , 8x=96+2x ,8x 2x=96+2x 2x, 6x=96 ,6x4=96 %x=16(61 ) 6 (x+1 ) =0.5 (1

28、0x+16 ), 6x+6=5x+8 ,6x+6 6=5x+86,6x 5x=5x+2 5x, x=2(62) 5 (x+2) =4 (x+9),5x+10=4x+36 , 5x 4x=3610,x=26 ;(63) 127.5 + (2x+3 ) =15,127.5 + (2x+3) X (2x+3) =15 X ( 2x+3 ), 15X (2x+3) =127.5,15X (2x+3) -15=127.5 T5,2x+3=8.5 ,2x+3 3=8.5 3,2x=5.5 , 2x=5.5 2x=2.75 ;(64) 3 (x+2) =4 (x+1 ), 3x+6=4x+4 , 3x+6

29、3x=4x+4 3x, x+4=6 , x+4 4=6 4, x=2 ;(65) 8 (x 1.5) =x+0.6 ,8x 12=x+0.6 , 8x 12+12=x+0.6+12 , 8x=x+12.6 ,8x x=x+12.6x,7x=12.6 ,7x 寸=12.6 之，x=1.8 ;(66) 7 (x+6)3x=4 (2x+5 ),7x+42 3x=8x+20 , 4x+42=8x+20 , 4x+42 4x=8x+20 4x, 4x+20=42 ,4x+20 20=42 20,4x=22 , 4x 44=22 4, x=5.5 ;(67) 4x 2 (5.5 x) =3.5x 8,4x

30、 11+2x=3.5x8,6x 11=3.5x 8,6x 11 + 11=3.5x8+11,3.5x+3=6x ,3.5x+3 3.5x=6x3.5x,2.5x=3 ,2.5x5=3 25, x=1.2文案大全4x=6 , 4x-4=6-4,(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(y 4)7(7 y)9=12 3(9 y),5y 20 49+7y 9=12 27+3y ,12y 78=3y15,12y 78+78=3y15+78 ,12y 3y=3y+6

31、3 3y,9y=63 ,9y 令63y=7(70) 35 (x 2)15 (5x 6) =22x 63 21 (3x 4),35x 70 75x+90=22x63 63x+84 ,35x 75x 22x+63x=63+84 90+70 ,x=1(71) 2.6x=51.63.4x,2.6x+3.4x=51.63.4x+3.4x ,6x=51.6 ,6x651.6 ",x=8.6;(72) 3 (4x 2)2 (3x+3) =9 8x,6x 12=9 8x,6x 12+8x=98x+8x ,14x 12=9 ,14x 12+12=9+12 ,14x=21 ,14x-14=21 T4,x

32、=1.5 ;(73) 20+4x=6x 24, 20+4x 4x=6x 24 4x, 2x 24=20 , 2x 24+24=20+24 , 2x=44 , 2x右=44右， x=22 ;(74) 5(x1) =x+1 , 5x 5=x+1 , 5x 5 x=x+1 x, 4x 5=1 , 4x 5+5=1+5 ,x=1.5 ;(75) 3 (3x 2) =10 0.5 (x 3.5),9x 6=11.75 0.5x,9x 6+0.5x=11.750.5x+0.5x ,9.5x 6=11.75,9.5x 6+6=11.75+6 ,9.5x=17.75 ,9.5x25=17.75 4.5,47x

33、=；33(76) 0.4 (x 0.2) +1.5=0.7x0.38,0.4x+1.42=0.7x0.38,0.4x+1.420.4x=0.7x0.38 0.4x,0.3x 0.38=1.42 ,0.3x 0.38+0.38=1.42+0.38 ,0.3x=1.8 ,0.3x £3=1.8 F.3,x=6;(77) (0.6x+420 ) + (x+20) =3,(0.6x+420) + (x+20) X (x+20) =3 X (x+20 ),3 (x+20) =0.6x+420 ,3x+60=0.6x+420 ,3x+60 0.6x=0.6x+4202.4x+60=420 ,2.4x+60 60=420 60,2.4x=360 ,2.4x2.4=3602.4,x=150 ;(78) 35 (2 x) +15 (6 5x) =22x+7+21 (4 160 110x=9141x,160 110x+110x=9141x+110x,69x+91=160 ,69x+9191=160 91 ,69x=69 , 69x69=6969,x=1(79) 5 (3x 4)2(x1) =5 (2x1)15x 20 2x+2=10x5,13x 18=10x5,13x 18 10x=10x510x,3x 18= 5,3x 18+18=5+18,3x=13 ,0.6x,