3x(x+1)=2x(x+1),怎么算?
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x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
x/(x-1) -1=3/(x-1)(x+2)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
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2(x的平方-3x+1)-(3x-3-x的平方)怎么算?