1/2+(-2/3)-(-4/5)+(-1/2)=?10/3+(-11/4)-(-5/6)+(-7/12)=?

问题描述:

1/2+(-2/3)-(-4/5)+(-1/2)=?10/3+(-11/4)-(-5/6)+(-7/12)=?
求几个题啊

2/15 5/6