小数方程计算专项练习题

1、百度文库 小数方程专项练习（有答案）(8 ) 6x8.5 4=20(x+0.55) 4=3.6(9 ) 36*0.42x 8=0.81.52+2x=54.7x=1.9x+7(10 ) 9.6x - x=43(11) 3x4X0.9=46.2(12 ) 3.5x-47=42(5) 12.6 (x+4.8)e=63(6) 12.5+4x=21.7(13 ) x- 0.9x=81.9 13.5x- 8.5x=20(14 ) 3.8+5x=12.3百度文库(22 ) 1.6X8- 5x=2.3(30 ) 13x- 7.5x=18.7 , (23 ) 2.5x20=16(15 ) 4 (0.3+x )

2、=6.8(24 ) 6.2x-x=41.6(16) 8x- 1.6x=19.2(17 ) x 勺.8=1.62(25 ) x田.5=48.6 2(18 ) 22.52+5x=135 ,(26 ) 5X-7.8=20.2,(19) 1.4x+9.8=22.4 ,(27 ) 2.5X -X=1.8 ,(20 ) 2 (x 3 ) =11.6,(28 ) (4.5+X) 2=13,(21) 68 - 4.4x=24 ,(29 ) 7x- 2X9=80,百度文库(38 ) (4.5+x) 2=63(46) 6x+4x - 11=32.9 (39) 2x2.5X10=15(31) (x+12) =108

3、,(32 ) 4x+3X0.7=6.5(40) 3.85+1.5x=6.1(41) 13 (x+2.5) =169(33 ) 2X (x 0.5) =1.6(34 ) 3x 2.34=4.914(42) 2x- 2+1.8=3.6(35 ) 1.44 殳=0.4(43 ) 7 (x- 1.2) =3.57(36 ) 2x+6=12.5(44) 2+1.8- 2x=3.6(37 ) 2.5x- x=1.2(45 ) 7x q.3=4.2百度文库 (55) 3x+7=29.5(47 ) 7 (x 1.2) =2.87(48 ) 2.4+3.4x=5.8(56 ) 5x- 2.8X1.2=1.04(

4、57 ) 4x+6x=28.5(49 ) 5 (x 1.2) =35(58 ) 2.38x+9.8=33.6(50) 2.5x+51=17 刈(51) 2.4x+1.6x=2.2(59 ) 2 (x 3) =10.6(52 ) 8 (x 6.2) =41.6(60 ) 13x- x=14.4(53 ) 0.5 (x 0.5) =7.5(61) 68- 1.1x=24(54 ) (9x+1.5+7x)芍=5.1(62 ) 3 (x+3.5) =21.6(63 ) 3x 54=136.5(71) 7殳0.7=1.3,(64 ) x- 0.36x=3.2(72 ) (5.9+x) -3+16=30,

5、(65 ) 4x+2.8M=19.32(73) 0.565-4x=0.4,(66 ) 4x - 5.2=5.2(74 ) 4 (x 0.5) =9.6 ,(67 ) 4.8x+2.6x=3.7(75 ) 2X (x+1.7) =9.2(68 ) 3x+6.4 X2=50.3(76 ) 8x - 4x=0.64(69 ) 2.7x- 1.8=1.2x+2.7 ,(77) 2x- 0.24=0.12(70 ) 8- 5 (6x+0.7) =10 x+0.5,(78) ( 3.82) x=14.4(79 ) 64 16X=56.8(85 ) 3 (5.4+X) 4=7.2,(80 ) 8.6X -

6、2.6X=36.6(86 ) 5.9X+7=8.7X ,(82 ) 64- 0.6X=6.36(87 ) 3+0.6x=4.32(83 ) 0.03X150 5x=3.2(88 ) 0.6 (y 0.4) =6,(84 ) 45.3- 4X=35.7 , 36=0.4 x36 书.4=0.4 米礼.4 x=90;9.6x - x=43(9.6- 1) x=438.6x3.6=43 3.5x=5 ;3x- 4X0.9=46.23x - 3.6=46.23x- 3.6+3.6=46.2+3.63x3=49.8 3x=16.63.5x-47=423.5x- 28=423.5x - 28+28=42+

7、283.5x=703.5x35=70 35 x=20 ;x- 0.9x=81.90.1x=81.90.1x 田.1=81.9 4.1 x=819;3.8+5x=12.33.8+5x-3.8=12.3-3.85x=8.55x4=8.5 4 x=1.7;4 (0.3+x) =6.84 (0.3+x) *=6.8% 0.3+x=1.70.3+x - 0.3=1.7 - 0.3 x=1.48x- 1.6x=19.26.4x=19.2 ,6.4x64=19.2 4, x=3 ;x勺.8=1.62 xT.8M.8=1.62 M.8,x=2.916;小数方程88题参考答案:(x+0.55) 4=3.6(x+

8、0.5)冲=3.6%x+0.5=0.9x+0.5 0.5=0.9 0.5x=0.42x 8=0.82x8 4=0.8 4x=3.21.52+2x=53+2x=53+2x -3=5-32x-2=2 2.x=1/4.7x=1.9x+74.7x- 1.9x=1.9x 1.9x+72.8x=72.8xe.8=7 e.8x=2.512.6 (x+4.8)e=636.3X (x+4.8) =636.3X (x+4.8) 3=6363 x+4.8=10 x+4.8 -4.8=10 4.8 x=5.2 ;12.5+4x=21.712.5+4x 12.5=21.7 12.54xF=9.2Fx=2.313.5x-

9、 8.5x=20 5x4=20 4 x=46x8.5M=206x- 34=206x- 34+34=20+346x4=54 由x=936*0.436 殳 x=0.4 x22.52+5x=135 , 45+5x- 45=135- 45, 5x4=90 芍， x=18 .1.4x+9.8=22.4 ,1.4x+9.8 - 9.8=22.4 - 9.8 1.4x=12.6 , 1.4x7.4=12.6 T.4, x=9;2 (x- 3) =11.6, 2x- 6=11.6, 2x- 6+6=11.6+6 , 2x=17.6, 2x2=17.6-2, x=8.8 ;68 - 4.4x=24 , /68

10、- 4.4x+4.4x=24+4.4x ,24+4.4x=68 ,24+4.4x - 24=68 - 24,4.4x=44 ,4.4x-4.4=44-4.4, x=101.6X8- 5x=2.312.8- 5x+5x=2.3+5x2.3+5x -2.3=12.8 - 2.3 5x4=10.55x=2.1 ;2.5x20=162.5x 登0 20=16X202.5x-2.5=320 2.5 x=128 ;6.2x- x=41.65.2x=41.6 5.2x62=41.6 62x=8 ;x田.5=48.6X2x 田.5=97.2x式.5X0.5=97.2 0.5 x=48.65X - 7.8=20

11、.2 , 5x- 7.8+7.8=20.2+7.8 ,5x4=28 4，x=5.6;2.5X -X=1.8 , 1.5x 勺.5=1.8T.5, x=1.2 ;(4.5+X) 2=13, (4.5+x) X2e=13 及， 4.5+x 4.5=6.5 -4.5 x=2 .7x- 2X9=80, 7x- 18=80, 7x- 18+18=80+18, 7x=98,7x7=987, x=14 ;13x- 7.5x=18.7 , (13-7.5) x=18.7, 5.5x=18.7 , 5.5x 5.5=18.75.5, x=3.4 ;(x+12) 6=108, (x+12) 6=1086, x+1

12、2=18, x+12 -12=18 -12, x=6 .4x+3X0.7=6.5尸4x+2.1=6.54x+2.1 - 2.1=6.5 -2.1/ 4x=4.44x-4=4.4 乂x=1.12X (x- 0.5) =1.6 2x- 1=1.6 2x- 1+1=1.6+1 2x=2.6 2xe=2.6妥 x=1.33x 2.34=4.914 7.02x=4.914 7.02x.02=4.914 月.02 x=0.71.44 殳=0.41.44殳笈=0.4次 0.4x=1.44 0.4x 用.4=1.44 4.4 x=3.6 (36) 2x+6=12.5 2x+6 - 6=12.5 - 6 2xe

13、=6.5e x=3.25 ;2.5x- x=1.21.5x=1.2 1.5xT.5=1.2T.5 x=0.8 ;(4.5+x) 2=63(4.5+x) X2e=63e/4.5+x 4.5=31.5 4.5 x=27;2x-2.5X10=15 2x- 25+25=15+25 2x及=40妥 x=20.3.85+1.5x=6.13.85+1.5x=6.13.85- 3.85+1.5x=6.1 -3.85 1.5x=2.251.5x勺.5=2.25 T.5 x=1.5 (41) 13 (x+2.5) =16913 (x+2.5)勺3=169勺3 x+2.5=13x+2.5 2.5=13- 2.5 x

14、=11.52x-2+1.8=3.6 2x - 0.2=3.6 2x+0.2 - 0.2=3.6+0.2 2x=3.8 2x及=3.8及 x=1.97 (x- 1.2) =3.577 (x- 1.2) -7=3.577x- 1.2=0.51x+1.2 - 1.2=1.2+0.51x=1.712+1.8- 2x=3.63.8 - 2x+2x=3.6+2x3.8 - 3.6=3.6+2x - 3.60.2e=2x及 x=0.1 ;7x q.3=4.27x 田.30.3=4.20.37x9=1.267 x=0.18 ;6x+4x - 11=32.910 x- 11+11=32.9+1110 x 勺0=

15、43.9 T0 x=4.39;7 (x - 1.2) =2.877 (x- 1.2)月=2.87 9 x- 1.2+1.2=0.41+1.2 x=1.612.4+3.4x=5.82.4+3.4x - 2.4=5.8- 2.43.4x=3.43.4x34=3.4 34 x=1 ;5 (x- 1.2) =355 (x- 1.2)芍=354x- 1.2=7x- 1.2+1.2=7+1.2 x=8.2 ;2.5x+51=17 刈2.5x+51=1362.5x+51 - 51=136 - 512.5x=852.5x25=85 -2.5 x=34 .2.4x+1.6x=2.24x=2.24x*2.2Fx=

16、0.55 ;8 (x- 6.2) =41.68 (x- 6.2) 4=41.63x - 6.2+6.2=5.2+6.2 x=11.4 .0.5 (x 0.5) =7.50.5 (x - 0.5)田.5=7.5田.5x- 0.5=15x-0.5+0.5=15+0.5 x=15.5;(9x+1.5+7x)芍=5.1 (16x+1.5)4=5.1 (16x+1.5)与 X5=5.1X5 16x+1.5=25.5 16x+1.5 1.5=25.5 1.5 16x=2416x16=246 x=1.5;3x+7=29.53x+7 - 7=29.5 - 73x=22.53x3=22.5 冯x=7.55x-2

17、.8X1.2=1.045x- 3.36=1.045x- 3.36+3.36=1.04+3.365x=4.45x4=4.4 4 x=0.884x+6x=28.510 x=28.810 xT0=28.5 勺 0 x=2.852.38x+9.8=33.62.38x+9.8 - 9.8=33.6 - 9.82.38x238=23.8 238 x=102 (x- 3) =10.62 (x 3)e=10.6及x - 3+3=5.3+3x=8.3;13x- x=14.412x=14.412x12=14.412 x=1.2 ;68- 1.1x=2468- 1.1x+1.1x=24+1.1x24=24+1.1x

18、 - 2444T.1=1.1x 勺.1 x=40.3 (x+3.5) =21.63 (x+3.5)与=21.63 x+3.5 3.5=7.2 3.5x=3.7;3x- 54=136.53x- 54+54=136.5+543x3=190.53 x=63.5 ;x- 0.36x=3.20.64x=3.2 0.64x.64=3.2 4.64x=5;4x+2.8 4=19.324x+11.2 -11.2=19.32- 11.24x*8.12F/x=2.03.4x - 5.2=5.24x- 5.2+5.2=5.2+5.2 / 4x=10.4 4x*10.4Fx=2.6;4.8x+2.6x=3.77.4x

19、=3.77.4xW4=3.7W4 x=0.5;3x+6.4 2=50.3 3x+12.8=50.3 3x+12.8 - 12.8=50.3- 12.83x=37.53x3=37.5 38x - 4x=0.644x=0.644x+0.64F x=0.16 .2x- 0.24=0.122x- 0.24+0.24=0.12+0.242x=0.362x 及=0.36 及 x=0.18 .(3.8-2) x=14.41.8x=14.41.8xT.8=14.4 勺.8 x=8 .64- 16X=56.864- 16X+16X=56.8+16X 16X+56.8=64 16X+56.8 - 56.8=64

20、- 56.8 16X=7.216X16=7.216 X=0.45 ;8.6X - 2.6X=36.66X=36.66X 4=36.6 与 X=6.1 ;/2.2 (X+8) =222.2 (X+8) 22=22 22 X+8=10 X+8 - 8=10- 8X=2;64- 0.6X=6.3624 - 0.6X=6.3624 - 0.6X+0.6X=6.36+0.6X0.6X+6.36=240.6X+6.36 - 6.36=24 - 6.360.6X=17.640.6X 田.6=17.64礼.6X=29.40.03X150- 5x=3.24.5- 5x=3.2 ,x=12.5.2.7x- 1.8

21、=1.2x+2.7 ,2.7x- 1.8+1.8=1.2x+2.7+1.8 , 2.7x- 1.2x=1.2x+4.5 - 1.2x 1.5x1.5=4.51.5,x=3;8- 5 (6x+0.7) =10 x+0.5,8- 30 x-3.5=10 x+0.5, 4.5- 30 x+30 x=10 x+0.5+30 x4.5- 0.5=40 x 0.5,4F0=40 x 乂0,x=0.1 ;7殳-0.7=1.3, 7” 0.7+0.7=1.3+0.7,7殳x=2次，7妥=2x受， x=3.5 ;(5.9+x) -3+16=30,(5.9+x)与+16-16=30 - 16, (5.9+x) -3X3=14X3,5.9+x - 5.9=42 - 5.9, x=36.1 .0.565-4x=0.4,2.8- 4x=0.4,4x+4x=0.4+4x ,