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问题 选择题
下列变形中正确的是（　　）
A．
(-9)×(-25)
=
-9
×
-25
B．
-49
-16
=
-49
-16
C．
(-3)2
=-3		D．(
1.5
)2=-(-1.5)
答案

A、

-9
和
-25
，被开方数是负数，则没有意义，故选项错误；

B、

-49
，
-16
，被开方数是负数，则没有意义，故选项错误；

C、

(-3)2
=3，故选项错误；

D、正确．

填空题

根据短文内容和汉语提示，写出短文空白处各单词的正确形式

Dear Editor,

     I'm sorry to trouble you. I'm a middle school student. I'm (1)__________(担心的) about the

problems among (2)__________( 我们的) classmates.

     Problem 1: In our school (3)__________(大部分) students are stressed out because they

have too much (4)__________(作业) to do. They don't have enough (5)__________(时间) for

their hobbies.

     Problem2: Some students (6)__________(是) tired of study. They enjoy playing computer

games (7)__________(每) day.

     Problem3: Some (8)__________(男孩) fight with each other. They don't know how to get on

well (9)__________(和...一起) others.

     I'm (10)__________(等候) for your advice. Thanks a lot!
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名词解释

文克勒地基
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