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(5+0,5)kwadrat + xkwadrat-y kwadrat
25+2+0,25 +25+0,25=52,5
x²+2xy+y² + x²-y² = 25 + 5 + 0,25 + 25 - 0,25 = 55
y=0,5
(5+0,5)²+ (5+0,5)(5-0,5)=30,25+5,5×4,5
=30,25+24,75=55.