@ @YQ@ @pý†bɾa@ @ .(3x + 1)2 = −2x () . 9x 2 + 8x + 1 = 0 x = −8 ± 64 − 36 18 = −8 ± 28 18 = −8 ± 2 7 18 = −4 ± 7 9 .x2 = −4 − 7 x1 = −4 + 7 9 9 ) . 2x − 1 = 3 ( x 2x 2 − 1 = 3x 2x2 − 3x − 1 = 0 x = 3± 9+8 4 = 3 ± 17 4 .x2 = 3 − 17 x1 = 3+ 17 4 4