14/15*13/19+13/15*5/19求简便方法

问题描述:

14/15*13/19+13/15*5/19求简便方法

14/15*13/19+13/15*5/19=
(14*13+13*5)/15*19=
13(14+5)/15*19=13/1573/47*67+69*73/26求简便方法73/47*67+69*73/26=73(67/47+69/26)=73(67/47+3/2)=73(