能简算的要简算7/9×5/13+8/13÷9/2

问题描述:

能简算的要简算7/9×5/13+8/13÷9/2

7/9×5/13+8/13÷9/2
=35/117 + 8/13× 2/9
=35/117 + 16/117
=51/117
=17/39