1.2×5-0.9x=0.6

(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0（18-80x）/12-(1.3-3x)/2-(50x-4）/3=0（18-80x）-6(1.3-3x)-4(50x-4）=

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

1.2X=7.2X=7.2/1.2X=6X+1.5=10X=10-1.5X=8.54(X+2.4)=24.8X+2.4=24.8/4X+2.4=6.2X=6.2-2.4X=3.85X-4×9=245X

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

x=2x+12.6移项得：X-2X=12.6合并得：-X=12.6X=-12.60.6x+1.4=5移项得：0.6X=5-1.40.6X=3.6X=6.

x/4=30%x=4*30%=120%36/x=3/43x=36*4x=36*4/3=4810/x=2.5/0.82.5x=10*0.8x=10*0.8/2.5=3.2x/4=1.2/55x=4*1.

7(x-1.2)=5x7x-8.4=5x7x-5x=8.42x=8.4x=8.4÷2x=4.210.8÷2x=0.6×0.95.4x=0.54x=0.54÷5.4x=0.1

（1）5(x+2)=2(2X+7)5x+10=4x+145x-4x=14-10x=4(2)0.6(x-0.4)+3.8=1.2x+0.560.6x-0.24+3.8=1.2x+0.56-0.56-0.

1.2-0.9+5x=0.80.3+5x=0.85x=0.5x=0.1

2x=12.6x=6.3

5(x-1.7)=3（x+0.9）5x-8.5=3x+2.75x-3x=2.7+8.52x=11.2x=5.6再问：x+400分之0.6+400=3分之2，拜托

是5x乘(2x-3.3),还是5乘(2x-3.3),是5x乘(x+1.2),还是5乘(x+1.2)13x-5(2x-3.3)=2413x-10x+16.5=243x=24-16.53x=7.5x=2.

1、2x-4–12x+3=9-9x-10x-1=9-9xx=-102、9x+64=100-9x18x=36x=23、15-8+5x=7x+4-3x7+5x=4x+4x=-34、3x-21-2(9-8+

5(x+1/3)=15x+1/3=3x=8/38.4x-6x=0.62.4x=0.6x=1/412-3x=33x=9x=34x-0.9=8.74x=9.6x=2.4再问：第三个好像错了吧。12-3x=

0.6（5x-4.5x)=93x-2.7x=90.3x=9x=30

（1）0.6x+0.3=0.9x-0.20.9x-0.6x=0.3+0.20.3x=0.5x=0.5/0.5=5/3(2)3(x-1)-7(x+5)=30(x+1)3x-3-7x-35=30x+303

4X=14+3-97x-20-4x=14.51.2+5x+2.4=100.9x-27+13=674X=83X=14.5+205X=10-1.2-2.40.9X=67+27-13X=8/43X=34.5

#includesintjiesheng(intn)//用于计算阶乘如：3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x

①5x-3=3x-1+2-2x5x+3=x+14x=-2x=-1/2②3x-1+2-2x=1.2-2.7xx+1=1.2-2.7x3.7x=0.2x=0.054054③5x-3=1.2-2.7x7.7

2(0.9-x)+4=4.31.8-2x+4=4.35.8-2x=4.32x=5.8-4.32x=1.5x=0.75(x+1.8)/8=6.6.x+1.8=52.8x=52.8-1.8x=5112x+