Question

一道数学题目，求解答！用简便方法计算！

22/7×21/22×(22/7-22/3)×(-7/22)=?

Answer 1

22/7×21/22×(22/7-22/3)×(-7/22)
=(22/7×21/22)×[(22/7-22/3)×(-7/22)] （22/7和21/22相乘，分子分母相约）
=3×(-1+7/3)
=-3+7
=4
希望帮助到你，望采纳，谢谢~O(∩_∩)O~

Answer 2

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