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D( y )
2*y^2-(5*y)+2 = 0
2*y^2-(5*y)+2 = 0
2*y^2-(5*y)+2 = 0
2*y^2-5*y+2 = 0
2*y^2-5*y+2 = 0
DELTA = (-5)^2-(2*2*4)
DELTA = 9
DELTA > 0
y = (9^(1/2)+5)/(2*2) or y = (5-9^(1/2))/(2*2)
y = 2 or y = 1/2
y in (-oo:1/2) U (1/2:2) U (2:+oo)
(2*y^2-(7*y)+3)/(2*y^2-(5*y)+2) = 0
(2*y^2-7*y+3)/(2*y^2-5*y+2) = 0
2*y^2-7*y+3 = 0
2*y^2-7*y+3 = 0
DELTA = (-7)^2-(2*3*4)
DELTA = 25
DELTA > 0
y = (25^(1/2)+7)/(2*2) or y = (7-25^(1/2))/(2*2)
y = 3 or y = 1/2
(y-1/2)*(y-3) = 0
2*y^2-5*y+2 = 0
2*y^2-5*y+2 = 0
DELTA = (-5)^2-(2*2*4)
DELTA = 9
DELTA > 0
y = (9^(1/2)+5)/(2*2) or y = (5-9^(1/2))/(2*2)
y = 2 or y = 1/2
(y-1/2)*(y-2) = 0
((y-1/2)*(y-3))/((y-1/2)*(y-2)) = 0
( y-1/2 )
y-1/2 = 0 // + 1/2
y = 1/2
( y-3 )
y-3 = 0 // + 3
y = 3
y in { 1/2}
y = 3
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