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问题 解答题
计算：（1）(3
12
-2
1
3
+
48
)÷2
3

     （2）(2
6
+5)2011(2
6
-5)2013．
答案

（1）原式=（6

3
-
2
3
3
+4
3
）÷2
3

=

28
3
3
÷2
3

=

14
3
；

（2）原式=[（2

6
+5）（2
6
-5）]2011（2
6
-5）2

=（24-25）（24-20

6
+25）

=20

6
-49．

选择题

--- I haven’t seen Mary recently. And you?

--- Me neither. I’m afraid she _________ to her experiment for too long a time.

A．is devoting

B．was devoted

C．has been devoting

D．has been devoted
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名词解释

胃区
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