(-2/3-1/2)-(-1/3+5/6)解答此题,

问题描述:

(-2/3-1/2)-(-1/3+5/6)解答此题,

(-2/3-1/2)-(-1/3+5/6)
=-4/6-3/6+2/6-5/6
=-10/6
=-5/3回答正确,速度慢