问题
解答题
计算: (1)a-b+
(2)
|
答案
(1)原式=(a-b)(a+b)+2b2 a+b
=
;a2+b2 a+b
(2)原式=
÷xy (x+y)(x-y) x+y-x+y (x+y)(x-y)
=
•xy (x+y)(x-y) (x+y)(x-y) 2y
=
.x 2
计算: (1)a-b+
(2)
|
(1)原式=(a-b)(a+b)+2b2 a+b
=
;a2+b2 a+b
(2)原式=
÷xy (x+y)(x-y) x+y-x+y (x+y)(x-y)
=
•xy (x+y)(x-y) (x+y)(x-y) 2y
=
.x 2