问题 解答题
计算:
(1)
a2
a+3
-
9
a+3

(2)
2a-4
a2+6a+9
÷
a-2
a+3
•(a+3)

(3)
27
+
1
3
-
2
2

(4)(2-
3
)2-(2+
3
)(2-
3
)+
1
3
+2
答案

(1)原式=

a2-9
a+3

=

(a+3)(a-3)
a+3

=a-3;

(2)原式=

2(a-2)
(a+3)2
a+3
a-2
•(a+3)

=2;

(3)原式=3

3
+
3
3
-
2

=

10
3
3
-
2

(4)原式=4-2

3
+3-(4-3)+2-
3

=4-2

3
+3-1+2-
3

=8-3

3

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