13/21×17+8÷21/17 简便运算,我看过好多了,都不怎么样

问题描述:

13/21×17+8÷21/17 简便运算,我看过好多了,都不怎么样

13/21×17+8÷21/17
=13/21×17+8×17/21
= 13/21×17+17×8/21
=17×(13/21+8/21)
=17×1
=17