x/2 + (100-x) * 3 = 100
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x/2+(100-x)*3=100x/2+(100-x)*3=100x/2+(100-x)*3=100x/2+300-3x=1005x/2=200x=800.5x+300-3x=1002.5x=200
x/2 + (100-x) * 3 = 100
x/2 + (100-x) * 3 = 100
x/2 + (100-x) * 3 = 100
x/2+300-3x=100
5x/2=200
x=80
0.5x+300-3x=100
2.5x=200
x=80
x/2 + (100-x) * 3 = 100
x/2+300-3x=100
-5/2x=-200
x=80
去括号得：x/2+100*3-x*3=100
方程两边都减去300得：x/2-x*3=-200
即：0.5x-3x=-200
-2.5x=-200
x=80
等于80
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
x+2x+3x+.+100x
1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(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?
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
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先化简再求值(x+3x+5x+7x+.+101x)-(2x+4x+6x+...100x),其中x=51分之2
（X+X)+(X-X)+(X*X)+(X/X)=100
(X+1)X(X+2)X(X+3)=504
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x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?