Предмет: Алгебра, автор: yanafedenyuk06r

арифметическая прогрессии вычислите приведенную сумму: 1) 1 + 2 + 3 + ... + 20;
2) 1 + 2 + 3 ... + 15;
вычислите сумму:
1) всех двузначных натуральных чисел, кратных 5​

Ответы

Автор ответа: procenkodima05
0

Ответ:

1)210  2)120 1)50

Объяснение:

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