(5/12-3/7)-(4/7-7/12)能简算就要简算

问题描述:

(5/12-3/7)-(4/7-7/12)能简算就要简算

5/12-3/7-4/7+7/12
=5/12+7/12-(3/7+4/7)
=1-1
=0