Предмет: Математика, автор: tatanasulejmenova759

756. Какие свойства арифметических действий позволяют утверж выражения: дать, что тождественно равны 1) а + 20 и 20 + а; 2) bc + 7,1 и 7,1 + be; 4) 9(c + d) и 9c + 9d? 3) 19 + (a + b) и (a + b) + 19;

Ответы

Автор ответа: azuzhome0

Ответ:

1)равные2)равные3)равные4)равные

Пошаговое объяснение:так как их нужно поменять

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756. Какие свойства арифметических действий позволяют утверж выражения: дать, что тождественно равны 1) а + 20 и 20 + а; 2) bc + 7,1 и 7,1 + be; 4) 9(c + d) и 9c + 9d? 3) 19 + (a + b) и (a + b) + 19;​

Ответы

756. Какие свойства арифметических действий позволяют утверж выражения: дать, что тождественно равны 1) а + 20 и 20 + а; 2) bc + 7,1 и 7,1 + be; 4) 9(c + d) и 9c + 9d? 3) 19 + (a + b) и (a + b) + 19;