1) x²-5x+4=0
2) x²+3x-2=0
3) x²-2x+2,5=0
4) x²-3x+9,6=0
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1) x²-5x+4=0
2) x²+3x-2=0
3) x²-2x+2,5=0
4) x²-3x+9,6=0