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2014-07-18T16:55:51+03:00
X² -5x+6=0
D=b² -4ac
D=(-5)² -4*1*6
D=25-24=1

x1/2=-b +- √D /2
x1= -(-5)+1 /2 = 5+1/2 =3
x2=5-1/2 = 2