35*14怎么简便计算

问题描述:

35*14怎么简便计算

35*14=7*5*7*2=7*7*10=490

乘法结合律:35×14=35×2×7=70×7=490

35*14=(5*7)*(2*7)=5*7*2*7=(5*2)*(7*7)=10*49=490

=35*2*7=70*7=490

35*14
=7*5*2*7
=7*10*7
=490