简算题:7/9+11/5+2/9*5/11

问题描述:

简算题:7/9+11/5+2/9*5/11

7/9+11/5+2/9*5/11
=77/99+2/9*5/11+11/5
=87/99+11/5
=435/495+99/495+2
=2又534/495