22/7×21/22×(22/7-22/3)×(-7/22)=?
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22/7×21/22×(22/7-22/3)×(-7/22)=?22/7×21/22×(22/7-22/3)×(-7/22)=?22/7×21/22×(22/7-22/3)×(-7/22)=?22/7
22/7×21/22×(22/7-22/3)×(-7/22)=?
22/7×21/22×(22/7-22/3)×(-7/22)=?
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