5/7 X (-5/12) — 5/7 X 5/12 — 5/3 X 1/4 =

问题描述:

5/7 X (-5/12) — 5/7 X 5/12 — 5/3 X 1/4 =

5/7 X (-5/12) -5/7 X 5/12 -5/3 X 1/4 =5/7x(-5/12-5/12-1/4)=5/7x(-10/12-1/4)=5/7x(-10/12-3/12)=5/7x-13/12=65/84 回答完毕,