当a＜0时,化简：a^2-a分之根号下a^2-2a+1
问题描述：
当a＜0时,化简：a^2-a分之根号下a^2-2a+1
答
因为a所以a-1根号下（a2-2a+1）/(a2-a)
=根号下（a-12/a(a-1)
=｜a-1｜/a(a-1)
=(1-a)/a(a-1)
=-1/a
答
√(a²-2a+1)/(a²-a)
=√(a-1)²/(a(a-1))
=|a-1|/(a(a-1))
因为a