0.2x=6

0.13x-0.13=0.07x+0.070.13x-0.07x=0.13+0.070.06x=0.2x=20/6(二十分之六）都乘以6030x-10x+7.5x-6x=43/6021.5x=43/6

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7

6/x+1=x-5/x^2+x6/x+1=x-5/x（x+1）两边同乘x（x+1）6x=x-5x=-1但是x（x+1）≠0x≠0或-1所以该方程无解

27046=2x(10000)+7x(1000)+4x(10)+6x(1)

3x*x=1+x得6x*x*x+7x*x-5x+2000=3x^2*2x+7x^2-5x+2000=(1+x)2x+7x^2-5x+2000=9x^2-3x+2000=3(3x^2-x)+2000=3

(x+7)(x+6)-(x-2)(x+1)=x^2+13x+42-x^2+x+2=14x+44=2(7x+22)

2-x+5/6=x-x-1/3两边乘612-x-5=6x-2x+27-x=4x+25x=5x=10.1-0.2x/0.03-1=0.7-x/0.4两边乘1.240-80x-1.2=5.1-3x77x=

当然能算出来X-X×0.2=1.18（1-0.2）X=1.180.8X=1.18解得X=1.475

0.6（4-x）-5(0.2x+0.34)+5.3=02.4-0.6x-x-1.7+5.3=01.6x=6x=3.752x-3/2+x+6/5=7x-3/107x-2x-x=6/5-3/2+3/104

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-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=

(1)6分之x-7分之x=84x/42=84x=42*84=3528(2)x-x/6=95x/6=9x=54/5=10.8(3)3.5*2-0.2x=20.2x=5x=25(4)30％x+15=900

（1）2x=1/12,x=1/24(2)-0.4x=-5.3-2.4+1.7=-6;x=15(3)5x=5/6-2/3+10/3=1/6+20/6=21/6;x=21/30=7/10(4)3(3x-5

x-0.2x=800.8X=80X=100在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.

(X-5)(X-6)=X-5则(x-5)(x-6)-(x-5)=0则(x-5)(x-6-1)=0则(x-5)(x-7)=0所以x=5或x=7

(X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9)[(x-4)(x-6)-(x-5)2]/(x-5)(x-6)=[(x-7)(x-9)-(x-8)2]/(x

(2x-5)(3x+2)-6(x+1)(x-2)=6x²+4x-15x-10-6(x²+x-2x-2)=6x²-11x-10-6(x²-x-2)=6x²

intx=6;x+=(x-=x*x);等价于：x=(x+=(6-(6*6)))=(x+=-30)=-60;再问：(x-=x*x)为什么是同时赋值6再答：因为有个等号，所以需要先保存x=6，再计算x*x

(1)3x(x+0.2)=4x(x-1.1)3x+0.6=4x-4.44x-3x=0.6+4.4x=5(2)乘以0.8得4(1-x)=3x4-4x=3x4=7xx=4/7（7分之4）（3）1.1x1.