（1）计算：-3-8+(-2)2+|4-3|（2）已知2a-1的平方根是±3，3_爱下问搜题

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问题解答题

（1）计算：-

3	-8

+

(-2)2

+|

4

-3|
（2）已知2a-1的平方根是±3，3a+b-1的算术平方根是4，求12a+2b的立方根．
（3）已知a的倒数是-

1

2

，

b

的相反数是0，c是-1的立方根，求a²+b²+c²的值．

答案

（1）原式=2+2+3-

4

=7-2

=5．

（2）由题意得，2a-1=9，3a+b-1=16，

解得：a=5，b=2，

故12a+2b=64，64的立方根为4．

（3）由题意得，a=-

2

，b=0，c=-1，

则a²+b²+c²=3．

完形填空

Homesick is a compound (复合的) word that is made up of HOME and SICK. You know what each         means on its own, of course. But do you know the meaning          they are used together? The definition (定义) of homesick is SICK FOR HOME. It means you miss your home.
Now think for a minute          SEASICK. If you change the word HOME in the word “homesick” to the word SEA, does the way above of giving the definition           SEASICK? Does seasick mean SICK FOR SEA? No, it doesn’t. It means something quite          . Seasick means SICK BY THE MOVEMENT(航行) ON THE SEA. When you are         , the only place you want to be is at home. When you are seasick,          you want to be is at sea.
Have you ever heard of a person being heartsick? Heartsick doesn’t mean that something is wrong with a person’s           . People are heartsick when they are            deep inside as if (好像) their hearts are broken.
And we also have other compound words, such as handshake and        . Perhaps you may write definitions for them. It must be helpful to know something like this in your English study.

B．heartsick　　　　

A．the first place

B．the last place 　　　

C．the only place

D．the safe place

B．invited　　

B．height　　　　

单项选择题

上颌第一磨牙

A．上牙槽后神经+腭前神经
B．下牙槽神经+颊长神+舌神经
C．上牙槽前神经+鼻腭神经
D．下牙槽神经+舌神经
E．上于槽中神经+上牙槽后神经+腭前冲经
拔除下列牙时，应麻醉哪组神经