化简(a-2)²-(1-b)(b+1)
问题描述:
化简(a-2)²-(1-b)(b+1)
答
(a-2)²-(1-b)(b+1)
= (a-2)²-(1-b)(b+1)(a-2)²-(1-b)(b+1)
= (a-2)²-(1-b^2)
=a^2一4a一1十b^2