问题 解答题
(1)计算:
2
×(
2
+
1
2
)-
18
-
8
2

(2)化简:(
2x
x-3
-
x
x+3
)•
x2-9
x
答案

(1)原式=2+1-(

9
-
4
)=3-1=2;

(2)原式=

2x2+6x-x2+3x
(x-3)(x+3)
x2-9
x

=

x(x+9)
x2-9
x2-9
x

=x+9.

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