Ответ:
5 3/4+2 7/20=(5+2)+(3/4+7/20)=7+(15/20+7/20)=7 22/20=8 2/20
(8 2/20-3 1/2)=5 1/20
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Ответ:
5 3/4+2 7/20=(5+2)+(3/4+7/20)=7+(15/20+7/20)=7 22/20=8 2/20
(8 2/20-3 1/2)=5 1/20