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x + 1 - druga liczba
x + 2 - trzecia liczba
x² + (x + 1)² + (x + 2)² - 11 = 3 x (x + 1)
x² + x² + 2 x + 1 + x² + 4 x + 4 - 11 = 3 x² + 3 x
3 x = 6
x = 2
x + 1 = 3
x + 2 = 4
Te liczby to 2, 3, 4.
Pozdro))