(A+2-2-A分之4)÷A-2分之A计算
问题描述:
(A+2-2-A分之4)÷A-2分之A计算
答
=[(A+2)(A-2)+4]/(A-2)]÷[A/(A-2)]
=[A²/(A-2)]×[(A-2)/A]
=A