Здравствуйте! ПОмогите, пожалуйста, решить - 1) 3 1/7 - (19/21 - 1/14)= ? 2) 2 4/9 - (1 5/6-11/12)=? 3) 3 5/11 - (4 15/33 - 3 11/55)=? Спасибо!
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