5/12+11/15-6/15+11/12
=(5/12+11/12)+(11/15-6/15)
=16/12 + 5/15
=4/3 + 1/3
=5/3
王八蛋鸡。。
5/12+11/15-6/15+11/12=(5/12+11/12)+(11/15-6/15)=16/12 + 5/15=4/3 + 1/3=5/3