@ @XY@ @pý†bɾa@ @ . () . 1 x2 . 2x2 − 10x + 3 = 0 () 2x2 − 10x + 3 = 0 x 2 − 5x + 3 = 0 2 x 2 − 5x = − 3 2 x2 − 5x + 25 = − 3 + 25 4 24 2 x − 5 = 19 2 4 x − 5 = ± 19 22 x = 5 ± 19 22 .x2 = 5 − 19 x1 = 5 + 19 2 2 2 2