Odpowiedzi

2010-03-09T23:14:19+01:00
A - bok prostokąta, b - bok prostokąta

2a + 2b = 80
2(a+25%a) + 2(b-6) = 80

2a = 80 - 2b /2
a = 40 - b

5/2(40 - b) + 2b - 12 = 80
100 - 5/2b + 2b - 12 = 80
-0,25b = -8 / * (-4)
b = 32
a = 8