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Автор - tn0202021

Вычислите. пожалуйста помогите . срочно

Ответ

Проверено экспертом

Автор - dnepr1
-3 frac{5}{21} :1 frac{22}{63} +1 frac{3}{35}:1 frac{1}{56} =
= -frac{68*63}{21*85} + frac{38*56}{35*57} =- frac{68*3}{1*85} + frac{2*56}{35*3} .
Приводим к общему знаменателю:
 frac{-204*21+112*17}{1785} = frac{-4284+1904}{1785} =
 =  -2380/1785 = - frac{4}{3} .

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