计算:1/12-5/12-6/12-1又9/20+1又11/15

问题描述:

计算:1/12-5/12-6/12-1又9/20+1又11/15

1/12-5/12-6/12-1又9/20+1又11/15
=(1-5-6)/12-1-9/20+1+11/15
=-5/6-9/20+11/15
=-50/60-27/60+44/60
=-33/60
=-11/20