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51.(2008福建福州)化简:

解:原式=

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50.(2008江苏镇江)计算化简

解:原式····················· (1分)

····················· (2分)

···························· (4分)

.  ················(5分)

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49.(2008江苏扬州)课堂上,李老师出了这样一道题,

已知x=2008-5,求代数式的值,小明觉得直接代入计算太繁了,请你来帮他解决,并写出具体过程。

解:原式=

     =

     =

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48. (08年山东省)先化简,再求值:

÷,其中. 

解:原式=   ……………………………2分

     …………………………………………3分

.    ……………………………………………………………4分

时,

原式=. 

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47. (2008年江苏南充市)化简,并选择你最喜欢的数代入求值.

解:原式······················································································ 2分

·········································································································· 4分

···························································································································· 5分

选取除0与1以外的任何值,求代数式的值   6分

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46.(2008江苏盐城)先化简,再求值:,其中

解:原式            

当x=-4时,原式=     

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45.(2008湖北孝感)请你先将式子化简,然后从1,2,3中选择一个数作为的值代入其中求值。

解:原式=

取a=2,原式=2008。(取a=3,原式=1004)

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44.(2008湖北襄樊)化简求值:

 

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43. (2008湖北武汉)先化简,再求值:,其中

解:提示:

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42. .(2008广东深圳)先化简代数式÷,然后选取一个合适a值,代入求值.

解: 方法一: 原式=         

                    

(注:分步给分,化简正确给5分.)

方法二:原式=

          

               

a=1,得                                 

原式=5                                    

(注:答案不唯一.如果求值这一步,取a=2或-2,则不给分.)

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