（a＋b）（a-b）-（a+2b）（a-b）要过程

Question

如题所述

Answer 1

如果是因式分解，那么：
(a+b)(a-b)-(a+2b)(a-b)
=(a-b)[(a+b)-(a+2b)]
=(a-b)(a+b-a-2b)
=(a-b)(-b)
=-b(a-b)

如果是化简，那么：
(a+b)(a-b)-(a+2b)(a-b)
=a²-b²-(a²-ab+2ab-2b²)
=a²-b²-(a²+ab-2b²)
=a²-b²-a²-ab+2b²
=b²-ab

Answer 2

=a^2-b^2-(a^2-ab+2ab-2b^)
=a^2-b^2-a^2-ab+2b^2
=b^2一ab

Answer 3

=(a-b)[(a+b)-(a+2b)]
=(a-b)(a+b-a-2b)
=(a-b)•(-b)
=b²-ab

Answer 4

=(a-b)[a+b-(a+2b)]
=(a-b)(a+b-a-2b)
=(a-b)(-b)
=b(b-a)

Answer 5

（a＋b）（a-b）-（a+2b）（a-b）
=a²-b²-(a²-2b²+ab)
=a²-b²-a²+2b²-ab
=b²-ab