3x+(100-x)/3=100
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3x+(100-x)/3=1003x+(100-x)/3=1003x+(100-x)/3=1003x+(100-x)/3=1009x+100-x=3009x-x=300-1008x=200x=200÷
3x+(100-x)/3=100
3x+(100-x)/3=100
3x+(100-x)/3=100
3x + (100 - x)/ 3 = 100
9x + 100 - x = 300
9x - x = 300 - 100
8x = 200
x = 200÷8
x = 25
等式两边同时乘以3得：
9x+100-x=300；
8x=200；
x=25；
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
3x=x+100 x=?
x+2x+3x+.+100x
（X+X)+(X-X)+(X*X)+(X/X)=100
X+100=3X
3x=100+x
3x=100+x
3x=x+100
3x=x+100
解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)=
1x+2x+3x+4x+5x+6x+7x…+99x=100
100×2x+10x+3x+216=100×3x+10×2x+x
解方程:x-2x+3x-4x+...+99x-100x=25
解方程：x-2x+3x-4x+.+99x-100x=25
x-2x+3x-4x+...+99x-100x=25