ответ
L = 2*(a + b) + 2*(a + c) + 2*(b + c) + d =
= 4*(a + b+ c) + d = 4*(25+18+9) + 30 = 4*52 +30 = 238 см
ответ
L = 2*(a + b) + 2*(a + c) + 2*(b + c) + d =
= 4*(a + b+ c) + d = 4*(25+18+9) + 30 = 4*52 +30 = 238 см