35*14怎么简便计算
问题描述:
35*14怎么简便计算
答
35*14=7*5*7*2=7*7*10=490
答
乘法结合律:35×14=35×2×7=70×7=490
答
35*14=(5*7)*(2*7)=5*7*2*7=(5*2)*(7*7)=10*49=490
答
=35*2*7=70*7=490
答
35*14
=7*5*2*7
=7*10*7
=490