X×X-(X-10)(X-10)=30×30
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X×X-(X-10)(X-10)=30×30X×X-(X-10)(X-10)=30×30X×X-(X-10)(X-10)=30×3050口算，，X=1X=50
X×X-(X-10)(X-10)=30×30
X×X-(X-10)(X-10)=30×30
X×X-(X-10)(X-10)=30×30
50
口算，，X=1
X=50
80%x+30-x=10%x
X×X-(X-10)(X-10)=30×30
30(x+5)=26x+10x(x+5)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
(x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5)
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4)
25％x+x=10 x=?
X+X-10+X+8=100
10x+x*x=40
求x:x(10^x)=100
x^2+10x( )=(x+ )^2
x^2-10x=2-x
2x×x=10,求x
x²-10x+()=(x-)²
3x-x(10-x)=15
x(x-20)=x+10
x*x-10*x=13急