问题
解答题
化简: (1)
(2)
|
答案
(1)原式=
•12xy 5
=1 9x2y
;4 15x
(2)原式=-
÷a-3 2(a-2)
=-a2-4-5 a-2
•a-3 2(a-2)
=-a-2 (a+3)(a-3)
,1 2(a+3)
当a=-
时,原式=-1 2
=-1 2(-
+3)1 2
.1 5
化简: (1)
(2)
|
(1)原式=
•12xy 5
=1 9x2y
;4 15x
(2)原式=-
÷a-3 2(a-2)
=-a2-4-5 a-2
•a-3 2(a-2)
=-a-2 (a+3)(a-3)
,1 2(a+3)
当a=-
时,原式=-1 2
=-1 2(-
+3)1 2
.1 5