38*42+38*42用简便方法计算
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38*42+38*42用简便方法计算
38*42+38*42
=(40-2)*(40+2)*2
=(40*40-2*2)*2
=(1600-4)*2
=3200-8
=3192
38*42+38*42用简便方法计算
38*42+38*42
=(40-2)*(40+2)*2
=(40*40-2*2)*2
=(1600-4)*2
=3200-8
=3192