January 2023 1 11 Report
Треугольник АВС равен треугольнику
A1B1C1. Известно, что
7AB+2A1B1=81;2BC+6B1C1=104;4AC+7A1C1=209
Найти периметр треугольника АВС.
Даю 100 баллов
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