Предмет: Алгебра, автор: sofiasuzymi2006

добрый вечер,извините кто может решить эти 2 задачи кому не сложно пожалуйста

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Автор ответа: 6coolfire9

За перший метр криниці робітникам заплатять 50 грн. За другий метр вже 20 грн більше, тобто 50 + 20 = 70 грн. За третій метр заплатять ще на 20 грн більше, тобто 70 + 20 = 90 грн, і так далі.

Отже, за викопання першого метра криниці робітники отримають 50 грн, за другий – 70 грн, за третій – 90 грн, за четвертий – 110 грн і так далі. Загалом за викопання криниці завглибшки 12 м робітники отримають:

50 + 70 + 90 + 110 + 130 + 150 + 170 + 190 + 210 + 230 + 250 + 270 = 1550 (грн).

Отже, робітники отримають 1550 грн за викопання криниці завглибшки 12 м.

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