Question

(8/9+10/7+6/11)/(3/11+5/7+4/9)用简便方法怎样计算?

Answer 1

8/9是4/9的两倍
10/7是5/7的两倍
6/11是3/11的两倍
所以分子总和是分母的两倍.
结果=2
(8/9+10/7+6/11)/(3/11+5/7+4/9)
=2*(4/9+5/7+3/11)/(3/11+5/7+4/9)
=2*1
=2