简便方法算出（5/12+2/5）除以35/36

分类: 作业答案 • 2021-12-31 11:59:39

问题描述：

答

(5/12+2/5)÷35/36
=(5/12+2/5)×36/35
=5/12×36/35+2/5×36/35
=3/7 + 72/175
=75/175+72/175=147/175=21/25