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function kvadrt() {
d = document
var a = Number(d.form1.num1.value)
var b = Number(d.form1.num2.value)
var c = Number(d.form1.num3.value)
var diz = eval(Math.pow(b, 2) - 4 * a * c)
var e = eval((-b + Math.sqrt(diz)) / (2 * a))
var e1 = eval((-b - Math.sqrt(diz)) / (2 * a))
var e2 = eval(-c / b)
var e3 = eval(-b / 2 * a)
var x1 = Number(d.form1.x1.value)
var x2 = Number(d.form1.x2.value)
if (a == 0 && b == 0 && c == 0) {
x1 = "x принадлежит R";
x2 = "x принадлежит R";
} else
if (a == 0 && b == 0 && c != 0) {
x1 = "Решений нет";
x2 = "Решений нет";
} else
if (a == 0 && b != 0 && c != 0) {
x1 = eval(e2);
x2 = " ";
} else
if (a != 0 && diz > 0) {
x1 = eval(e);
x2 = eval(e1);
} else
if (a != 0 && diz == 0) {
x1 = eval(e3);
x2 = " ";
} else {
x1 = "Решений нет";
x2 = "Решений нет";
}
d.form1.x1.value = x1;
d.form1.x2.value = x2;
}