题目内容
计算:
原式,·············································· (3分)
,····························································· (6分)
.··········································································· (8分)
,····························································· (6分)
.··········································································· (8分)
试题分析:用乘法分配律计算较简单.
点评:解题时要根据题目特点,灵活运用运算律,以简化计算.
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