问题
解答题
计算: (1)
(2)
|
答案
(1)原式=a-3b+a+b a-b
=2a-2b a-b
=2(a-b) a-b
=2;
(2)原式=2a+b-b-2b (a+b)(a-b)
=2(a-b) (a+b)(a-b)
=
.2 a+b
计算: (1)
(2)
|
(1)原式=a-3b+a+b a-b
=2a-2b a-b
=2(a-b) a-b
=2;
(2)原式=2a+b-b-2b (a+b)(a-b)
=2(a-b) (a+b)(a-b)
=
.2 a+b