7/5-16/3-21/4 用脱式计算怎么做

问题描述:

7/5-16/3-21/4 用脱式计算怎么做

7/5-16/3-21/4
=21/15-80/15-21/4
=-59/15-21/4
=-(236/60+315/60)
=-551/60