问题
解答题
计算(1)
|
答案
(1)原式=
(2分)(x-1)+(2x+1) (x+1)(x-1)
=
(4分)3x x2-1
(2)原式=
×a-b a
×b2 (a-b)2
(2分)a2 b2
=
(4分)a a-b
计算(1)
|
(1)原式=
(2分)(x-1)+(2x+1) (x+1)(x-1)
=
(4分)3x x2-1
(2)原式=
×a-b a
×b2 (a-b)2
(2分)a2 b2
=
(4分)a a-b