问题
解答题
计算: (1)
(2)
|
答案
(1)原式=
÷1 (a+b)(a-b)
=a-b+a+b (a+b)(a-b)
•1 (a+b)(a-b)
=(a+b)(a-b) 2a
;1 2a
(2)原式=
÷a-1 a
=a2-2a+1 a
•a-1 a
=a (a-1)2
.1 a-1
计算: (1)
(2)
|
(1)原式=
÷1 (a+b)(a-b)
=a-b+a+b (a+b)(a-b)
•1 (a+b)(a-b)
=(a+b)(a-b) 2a
;1 2a
(2)原式=
÷a-1 a
=a2-2a+1 a
•a-1 a
=a (a-1)2
.1 a-1