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<?php error_reporting(-1); if (isset($_GET['send'])){ $a = (int) $_GET['a']; $b = (int) $_GET['b']; $c = (int) $_GET['c']; $result = eq_roots($a, $b, $c); } function eq_roots($a, $b, $c) { if ($a==0) return false; if ($b==0) { if ($c<0) { $x1 = sqrt(abs($c/$a)); $x2 = sqrt(abs($c/$a)); } elseif ($c==0) { $x1 = $x2 = 0; } else { $x1 = sqrt($c/$a).'i'; $x2 = -sqrt($c/$a).'i'; } } else { $d = $b*$b-4*$a*$c; if ($d>0) { $x1 = (-$b+sqrt($d))/2*$a; $x2 = (-$b-sqrt($d))/2*$a; } elseif ($d==0) { $x1 = $x2 = (-$b)/2*$a; } else { $x1 = -$b . '+' . sqrt(abs($d)) . 'i'; $x2 = -$b . '-' . sqrt(abs($d)) . 'i'; } } return array($x1, $x2); } ?> <p>Введите коэффициенты :</p> <h4>a * x<sup>2</sup> + b * x + с = 0</h4> <form method="GET"> <p>a = <input type="text" name="a" /></p> <p>b = <input type="text" name="b" /></p> <p>c = <input type="text" name="c" /></p> <input type="submit" name="send" value="решить"/> </form> <? if (isset($result)): ?> <hr /> <h3><?=$a ?> * x<sup>2</sup> + <?=$b ?> * x + <?=$c ?> = 0</h3> <p>Корни уравнения :</p> <p>X<sub>1</sub> = <?=$result[0] ?></p> <p>X<sub>2</sub> = <?=$result[1] ?></p> <? endif ?>
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