8x-0.8*0.75=2.4

4x+3.6﹦8x－4.83.6+4.8=8x-4x4x=8.4x=2.175(x-0.75)=60x75x-75×0.75=60x75x-60x=75×0.7515x=75×0.75x=5×0.75

(1)0.25x=-5x=-20(2)3x-4x=1-5x=4(3)3x-4x=18-5x=-13(4)1+7=x+7xx=1(5)9x-7x-3x=-8x=8(6)-x+3x=3-2x=1/2(7)

6x+1.5x=97.5x=9x=9/7.5X=1.218-0.2X=80.2X=18-8X=10/0.2X=50X-0.25=0.8X=0.8+0.25X=1.05

x-1/2x=421/2x=42x=84x-2/5x=3/83/5x=3/8x=3/8÷3/5x=5/8x+0.8x=361.8x=36x=2045-1/2x=51/2x=45-51/2x=40x=8

x-四分之一x=八分之三0.75x=八分之三x=1/2X-0.8X=220.2x=22x=22/0.2x=110三分之二X+二分之一X=427/6x=42x=42*6/7x=36

6x=24x=41.58*4=6.3210x=8x=0.870*0.8-29.5=26.5再问：确定答案吗？直接采纳喽

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+6=5x5x-2x=63x=6x=26x-28=2x6x-2x=284x=28x=78(x-3.6)=0.8x8x-0.8x=28.87.2x=28.8x=415x-110+7x=11015x+

1,（x+0.8)*2=2.42x+1.6=2.42x=2.4-1.62x=0.8x=0.42,7x/4=12+x7x=48+4x7x-4x=483x=48x=163,0.3x-8*0.7=0.1x0

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2.4x=3.2+1.6x=(3.2+1.6)/2.4x=27x-4x=2.43x=2.4x=0.89.7x-2.7x=357x=35x=55x+3x=2648x=264x=338x-6x=0.152

2x=12.6x=6.3

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

12x=8（x+1)12x=8x+812x-8x=84x=8x=29.8-2.4X=3.2X+4.2-2.4x-3.2x=4.2-9.8-5.6x=-5.6x=1

4.2+2.4=2.5x+0.8x3.3x=6.6x=2

（2.4-1.4-3）x=-2.8-2x=-2.8x=1.4再答：求采纳

x-4分之一x=8分之33x/4=3/8两边乘以86x=3x=3/6=0.5x-0.8x＝220.2x＝22x＝22/0.2x＝110

题目太多了请分开求助,我好多赚点采纳数哈:)多谢啦4×（0.8-x）=1.40.8-x=1.4÷4=0.35x=0.8-0.35=0.455+2/3x-1/2x=12(2/3x-1/2x)=12-5(

4×(0.8＋x)＝723.2＋4x＝724x＝72－3.24x＝68.8x＝68.8÷4x＝17.28x＋2x＝31.410x＝31.4x＝31.4÷10x＝3.14(x＋1.8)÷4＝2.5(x＋

第一题：x-x/5=2.45x-x=124x=12x=3第二题：12/5%x=8240x=8x=1/30第三题：4x+x=12.55x=12.5x=2.5