计算:3/(x+1)²-3x/(x-1)²=?
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计算:3/(x+1)²-3x/(x-1)²=?
计算:3/(x+1)²-3x/(x-1)²=?
计算:3/(x+1)²-3x/(x-1)²=?
3/(x+1)²-3x/(x-1)²=3(x-1)²/[(x+1)²(x-1)²]-3x(x+1)²/(x+1)²(x-1)²=[-3x3-3x²-9x+3]/[x4-2x²+1]
=3/(x+1) (x不等于正负1)