21/5×(22/7-22/3)×(-5/22)
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21/5×(22/7-22/3)×(-5/22)
21/5×(22/7-22/3)×(-5/22)
21/5×(22/7-22/3)×(-5/22)
21/5×(22/7-22/3)×(-5/22)
=21/5×(-5/22)×(22/7-22/3)
=-21/22×(22/7-22/3)
=-21/22×22/7-22/3×(-21/22)
=-3-(-7)
=-3+7
=4
结果是4