5/(5/7+5/9)怎么简便计算
问题描述:
5/(5/7+5/9)怎么简便计算
答
原式=5/(80/63)
=5x63/80
=63/16
5/(5/7+5/9)怎么简便计算
原式=5/(80/63)
=5x63/80
=63/16