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2*5 = 14 = 2² + 2 · 5
3*4 = 21 = 3² + 3 · 4
5*3 = 40 = 5² + 5 · 3
5*6 = 55 = 5² + 5 · 6
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jdi,
25*12 = 25² + 25 · 12 = 625 + 300 = 925