Ответ:
P = (a+b)*2 = (a + 0.4a)*2 = 2.8a = 42
a = 15
b = 6
S = a*b = 90
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Ответ:
P = (a+b)*2 = (a + 0.4a)*2 = 2.8a = 42
a = 15
b = 6
S = a*b = 90