x²-5x+6=0
D=25-6*4=25-24=1
x=(5±1)/2
x1=6/2=3
x2=4/2=2
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x²-5x+6=0
D=25-6*4=25-24=1
x=(5±1)/2
x1=6/2=3
x2=4/2=2