化简(a²-b²)-(a+b)(a-2b)=
问题描述:
化简(a²-b²)-(a+b)(a-2b)=
答
(a²-b²)-(a+b)(a-2b)=(a+b)*(a-b)-(a+b)(a-2b)
=(a+b)(a-b-a+2b)
=(a+b)*b
ab+b^2
答
原式=a²-b²-(a²-ab-2b²)
=a²-b²-a²+ab+2b²
=ab+b²