Предмет: Математика, автор: Anniona

Помогите с 4 и 5 пожалуйста

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Автор ответа: tan4ik3107

4.
как видно на рисунке стороны треугольников соотносятся как:
8:4=12:6=х:5
из данного равенства можно найти х
12:6=х:5
2=х:5
х=2*5
х=10 наша искомая сторона

Ответ: 10
5.
(3а-7в)²+42ав= 9а²-42ав+49в²+42ав= 9а²+49в²

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