Предмет: Алгебра, автор: zlataprokudina

хэлп ми, плиз!!!!!!!!

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Автор ответа: jalilovadilya39

Ответ:

площадь прямоугольного треугольника:ab/2

а^2=с^-b^=20

S=20+21/2=20,5

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