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Ответ

Ответ дан
Quantum2004

(7-y)²-y(y+3)=49-14+y²-y²-3y=49-17y

Ответ

Ответ дан
papagenius

Ответ:

Объяснение:

(7 - y)² - y(y + 3) = 7² - 2·7·y + y² - y² - 3y = 49 - 14y + y² - y² - 3y = 49 - 17y

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