问题
解答题
计算:(1)
(2)
|
答案
(1)原式=
+x(x+9) x(x+3)
=(x+3)(x-3) (x+3)2
+x+9 x+3
=x-3 x+3
=2;2(x+3) x+3
(2)原式=-
÷x-2 x-1
=-x2-4 x-1
•x-2 x-1
=-x-1 (x+2)(x-2)
.1 x+2
计算:(1)
(2)
|
(1)原式=
+x(x+9) x(x+3)
=(x+3)(x-3) (x+3)2
+x+9 x+3
=x-3 x+3
=2;2(x+3) x+3
(2)原式=-
÷x-2 x-1
=-x2-4 x-1
•x-2 x-1
=-x-1 (x+2)(x-2)
.1 x+2