用简便方法计算69×3/7 3/7

日期:2021-11-03 17:45:40 人气:1

用简便方法计算69×3/7 3/7

用简便方法计算69×3/7+ 3/7
解:
69×3/7+ 3/7
=(69+1)×3/7
=70×3/7
=30
    A+
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