13/7*17/12+13/6/12/17怎样简便运算
问题描述:
13/7*17/12+13/6/12/17怎样简便运算
答
13/7*17/12+13/6/12/17
=13/7*17/12+13/6*17/12
=17/12*(13/7+13/6)
=17/12*1
=17/12