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b=(68-2·3):4=(68-6):4=62:4=15,5cm
Obliczam długość
a=15,5+3=18,5cm
Obliczam pole
P=ab
P=15,5·18,5
P=286,75cm²
4x = 62
x = 15, 5
15, 5 × 18, 5 = 286, 75