用简便方法计算7¾×8¼
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用简便方法计算7¾×8¼
用简便方法计算7¾×8¼
用简便方法计算7¾×8¼
直接算,化成假分数,就很简单呀
7¾×8¼
=31/4*33/4
=93*3/16
=279/16
7¾×8¼
=(8-1/4)*(8+1/4)
=8²-(1/4)²
=64-1/16
=63+15/16
=63又15/16