问题
解答题
计算 (1)(x+y)•
(2)(
|
答案
(1)原式=
-x2 x-y
=y2 x-y
=x+y;(x+y)(x-y) x-y
(2)原式=
•x2-4+4 (x-2)2
=x-2 x
•x2 (x-2)2
=x-2 x
.x x-2
计算 (1)(x+y)•
(2)(
|
(1)原式=
-x2 x-y
=y2 x-y
=x+y;(x+y)(x-y) x-y
(2)原式=
•x2-4+4 (x-2)2
=x-2 x
•x2 (x-2)2
=x-2 x
.x x-2