题目内容
计算:
原式,··························································· (4分)
,············································································ (6分)
. (8分)
,············································································ (6分)
. (8分)
试题分析:首先计算除法,再计算减法即可.
点评:有理数的计算是基础题,在计算的过程中要注意运算顺序,注意特别容易出现符号的错误.
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