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
√(a²-2a+1)/(a²-a)
=√(a-1)²/(a(a-1))
=|a-1|/(a(a-1))
因为a