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x²+y²=65
(x+y)²-2xy=65
(x+y)²-2*28=65
(x+y)²=65+56
(x+y)²=121 odp. b)
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(a+b)²=a²+2ab+b²
(a+b)²-2ab=a²+2ab+b²-2ab=a²+b²