3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算

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3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算

3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21 计算
3又1/7 x (3又1/7 - 7又1/3)x 7/22 ÷1又1/21
=22/7 x7/22× (22/7 - 22/3)x 21/22
= (22/7-22/3)×21/22
=22/7×21/22-22/3×21/22
=3-7
=-4