问题
解答题
计算: (1)(
(2)(
|
答案
(1)原式=
×b-a ab ab a-b
=-1;
(2)[
+(x-2)2 (x+2)(x-2)
]×4x (x+2)(x-2) (x+2)(x-2) 1
=(x-2)2+4x
=x2-4x+4+4x
=x2+4.
计算: (1)(
(2)(
|
(1)原式=
×b-a ab ab a-b
=-1;
(2)[
+(x-2)2 (x+2)(x-2)
]×4x (x+2)(x-2) (x+2)(x-2) 1
=(x-2)2+4x
=x2-4x+4+4x
=x2+4.