用简便方法计算63*34+47*18 687+27*65-194
人气：448 ℃ 时间：2020-03-20 20:37:30
解答
63*34+47*18
=9*238+94*9
=9*332
=3320-332
=2988
687+27*65-194
=493+1755
=2248
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