问题
解答题
计算: (1)
(2)
|
答案
(1)原式=
•x+1 x
-4x2 (x+1)2 x+1-x+1 (x+1)(x-1)
=
-4x x+1 2 (x+1)(x-1)
=
;4x2-4x-2 (x+1)(x-1)
(2)原式=5x+3y-2x x2-y2
=3(x+y) (x+y)(x-y)
=
.3 x-y
计算: (1)
(2)
|
(1)原式=
•x+1 x
-4x2 (x+1)2 x+1-x+1 (x+1)(x-1)
=
-4x x+1 2 (x+1)(x-1)
=
;4x2-4x-2 (x+1)(x-1)
(2)原式=5x+3y-2x x2-y2
=3(x+y) (x+y)(x-y)
=
.3 x-y