2x²+5x+9-x-2=0
2x²+4х+7=0
D=b²-4ac=16+56=72>0, 2 корня
x1=
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2x²+5x+9-x-2=0
2x²+4х+7=0
D=b²-4ac=16+56=72>0, 2 корня
x1=