2/5x+100=1/2x
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2/5x+100=1/2x2/5x+100=1/2x2/5x+100=1/2x2/5x+100=1/2x4x/5x+200x=14x+1000x²=5x1000x²-x=0x（10
2/5x+100=1/2x
2/5x+100=1/2x
2/5x+100=1/2x
2/5x+100=1/2x
4x/5x+200x=1
4x+1000x²=5x
1000x²-x=0
x（1000x-1）=0
x1=0 x2=1/1000
2/5x+100=1/2x
4+1000x=5 方程两边同乘10x，去分母
1000x=1 移项整理
x=0.001 系数化1
(4/10x)-(5/10x)=-100
-1/10x=-100
x=1000
是2/(5x)吗 x=1/1000
X=1000/3
x=1000
解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
1x+2x+3x+4x+5x+6x+7x…+99x=100
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x(x-2)-2x(x+1)-3x(x-5) 其中x=负½
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
f(x,-x)=x^2+2x,fx(x,-x)=5x+1,则fy(x,-x)=
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4
(x+1)X百分之三十+（100-X）X百分之二十五=2/5X
2x(x-1)-x(2x-5)=15
5/x^2+x - 1/x^2-x=0
X-5+8*X=7*X-2*X-1
0.3(x+1)+0.25(100-x)=2/5x