问题:
计算或化简:
(1)
27
+
12
+
4
3
(2) (2
5
-
3
) 2
(3)(3
3
+2
7
)(3
3
-2
7
) (4)
a
(
a
+2)-
a2b
b
.
计算或化简:
(1)
+
+
(2) (2
-
) 2
(3)(3
+2
)(3
-2
) (4)
(
+2)-
.
(1)
27 |
12 |
|
5 |
3 |
(3)(3
3 |
7 |
3 |
7 |
a |
a |
|
||
|
参考答案: