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Автор - damir6579

найдите периметр abc стороны ab равна 9 см длина стороны Ac составляет 80%, длина стороны CB- 60% от длины стороны AB

Ответ

Автор - galiajunsaeva
9-20%=7.2
9-40%=5.4
7.2+5.4+9=21.6

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