问题
解答题
计算:(1)
(2)
|
答案
(1)原式=
=12-2(m+3) (m+3)(m-3)
=--2(m-3) (m+3)(m-3)
;2 (m+3)
(2)原式=
+x(x+9) x(x+3)
=(x+3)(x-3) (x+3)2
+(x+9) (x+3)
=(x-3) (x+3)
=2.2x+6 x+3
计算:(1)
(2)
|
(1)原式=
=12-2(m+3) (m+3)(m-3)
=--2(m-3) (m+3)(m-3)
;2 (m+3)
(2)原式=
+x(x+9) x(x+3)
=(x+3)(x-3) (x+3)2
+(x+9) (x+3)
=(x-3) (x+3)
=2.2x+6 x+3