Ответ:
5x + 12x + 13x = 90
x = 3
a = 15;
b = 36;
c = 39;
r = a + b - c / 2
r = 6
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Ответ:
5x + 12x + 13x = 90
x = 3
a = 15;
b = 36;
c = 39;
r = a + b - c / 2
r = 6