用简便方法计算63*34+47*18 687+27*65-194

问题描述:

用简便方法计算63*34+47*18 687+27*65-194

63*34+47*18
=9*238+94*9
=9*332
=3320-332
=2988
687+27*65-194
=493+1755
=2248