问题 解答题
(1)计算:2
3
×
315
×
612

(2)计算:2log510+log50.25.
答案

解(1)计算:2

3
×
315
×
612

=2

633
×
6(
3
2
)2
×
612

=2

633×(
3
2
)2×12

=2

636
=6;

(2)2log510+log50.25

=log5102+log50.25

=log5100×0.25

=log525

=2log55=2.

改错题
此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画
一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下画一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
    One day, I was cooking in the kitchen as the        
telephone rings. I went to answer it immediately.   
She was my close friend, Lisa. When we were talking   
on a phone, the fire alarm sounded. I ran back to the  
kitchen. The room full of smoke and the beef was badly 
burnt. I quickly turned off the gas, opening all the   
windows, and then went out of the house. In my      
surprise, two fire engines were outside his house. I   
was rather worried. I told about the firemen that it   
was my careless cooking which caused the heavy smoke. 
1._________        
2._________      
3._________         
4._________    
5._________                                              
6._________        
7._________       
8._________        
9._________          
10._________     
单项选择题 共用题干题