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