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Amina010905

a) :  frac{6 + 20}{2}  =  frac{26}{2}  = 13 \ b) frac{6  + 6 + 6 + 6 + 6 + 6 + 20}{7}  =  frac{56}{7}  = 8 \

Среднее ар.

Сумма всех чисел деленное на количество чисел

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