№4. Боковая сторона равнобедренного треугольника равна 9 см. Периметр треугольника равен 30см. Найти основание равнобедренного треугольника.
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08.12.2020 15:51
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12
Объяснение:
P=30
P=a+2b
30=a+2*9
a=30-18
a=12