问题
解答题
化简 (1)
(2)(
|
答案
(1)原式=
-a+b a-b
=a a-b
=a+b-a a-b
;b a-b
(2)原式=
•2y(y+3)-y(y-3) (y+3)(y-3) (y+3)(y-3) y
=
•y2+9y (y+3)(y-3) (y+3)(y-3) y
=
•y(y+9) (y+3)(y-3) (y+3)(y-3) y
=y+9.
化简 (1)
(2)(
|
(1)原式=
-a+b a-b
=a a-b
=a+b-a a-b
;b a-b
(2)原式=
•2y(y+3)-y(y-3) (y+3)(y-3) (y+3)(y-3) y
=
•y2+9y (y+3)(y-3) (y+3)(y-3) y
=
•y(y+9) (y+3)(y-3) (y+3)(y-3) y
=y+9.