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问题 解答题
计算或化简：
（1）(
1
3
27
-
24
-3
2
3
)•
12
；
（2）
2
b
ab5
•(-
3
2
a3b
)÷(3
b
a
)（a＞0，b＞0）．
答案

（1）原式=(

3
-2
6
-
6
)2
3

=6-12

2
-6
2

=6-18

2
；

（2）原式=-

2
b
b2
ab
(
3
2
a
ab
)×
1
3
a
b

=-3a2b2×

1
3b
ab

=-a2b

ab
．

选择题

—When did you find your pocket ________?

—It was when I was going to work by bus.[ ]

A. to pick  

B. to be picked

C. picked  

D. picking
查看答案
单项选择题

The villager told them that his village was ______ that of theirs.

A．three times larger than

B．as large as three times
C．three times as larger as

D．three times size of
查看答案