3/(x-1)²-3x/(x-1)² 计算
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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计算3/(x-1)
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 计算
3/(x-1)²-3x/(x-1)²
=(3-3x)/(x-1)²
=3(1-x)/(1-x)²
=3/(1-x)