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= 2/3
αβ = c/a
= 3/3
= 1
pers kB : x² - (α+1+β+1) x + (α+1)(β+1) = 0
x² - (2+α+β) x + (αβ +α+β+1) = 0
x² - (2+ 2/3) x + (1 + 2/3 + 1) = 0
------------------------------------------------- x 3
3x² - (6+2) x + (3+2+3) = 0
3x² - 8x + 8 = 0