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b - szerokość prostokąta
2a + 2b = 44
b = 4/7 a
2a + 8/7a = 44
b = 4/7 a
22/7a = 44
b = 4/7 a
a = 44 * 7 / 22
b = 4/7 a
a = 14
b = 8
P = ab
P = 14 * 8 = 112cm²
odp: Pole tego prostokąta to 112cm²