3/(x-1)²-3x/(x-1)² 计算
问题描述:
3/(x-1)²-3x/(x-1)² 计算
答
3/(x-1)²-3x/(x-1)²
=(3-3x)/(x-1)²
=3(1-x)/(1-x)²
=3/(1-x)