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a2 + b2 = 65 (2 po niewiadomej to druga potęga)
a = 11 - b
(11 - b)2 + b2 = 65
a = 11 - b
121- 22b + b2 + b2 = 65
a = 11 - b
2b2 - 22b = -56
a = 11 - b
b = 4
a = 7
b = 4
P = a*b = 7*4 = 28