问题
解答题
计算. (1)
(2)
|
答案
(1)
-x x-3 x x+3
=
-x(x+3) (x-3)(x+3) x(x-3) (x-3)(x+3)
=
;6x x2-9
(2)
+1 m+2 4 m2-4
=
+m-2 (m+2)(m-2) 4 (m+2)(m-2)
=
.1 m-2
计算. (1)
(2)
|
(1)
-x x-3 x x+3
=
-x(x+3) (x-3)(x+3) x(x-3) (x-3)(x+3)
=
;6x x2-9
(2)
+1 m+2 4 m2-4
=
+m-2 (m+2)(m-2) 4 (m+2)(m-2)
=
.1 m-2