22/7×21/22×(22/7-22/3)×(-7/22)=?

问题描述:

22/7×21/22×(22/7-22/3)×(-7/22)=?

22/7×21/22×(22/7-22/3)×(-7/22)
=-21/22×(22/7-22/3)
=-21/22×22/7+21/22×22/3
=-3+7
=4