(+3又1/7)*(3又1/7-7又1/3)*7/22*21/22

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(+3又1/7)*(3又1/7-7又1/3)*7/22*21/22
(+3又1/7)*(3又1/7-7又1/3)*7/22*21/22

(+3又1/7)*(3又1/7-7又1/3)*7/22*21/22
(+3又1/7)*(3又1/7-7又1/3)*7/22*21/22
=(22/7*7/22)*(3又1/7-7又1/3)*21/22
=(22/7-22/3)*21/22
=22/7*21/22-22/3*21/22
=3-7
=-4