x^2-10x+25/x-1÷x^2-1/5-x

问题描述:

x^2-10x+25/x-1÷x^2-1/5-x

(x²-10x+25)/(x-1)÷(x²-1)/(5-x)
=(x-5)²/(x-1)÷(x-1)(x+1)/(5-x)
=-(x-5)³/(x-1)²(x+1)
你确认题目没有错吗?