Начало
Калькуляторы
Квадратный Solver
Решает квадратные уравнения для введенных коэффициентов. Ответы могут быть или реальными или сложными.
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JavaScript Calculators: квадратный Solver
<!-- TWO STEPS TO INSTALL QUADRATIC SOLVER: 1. Copy the coding into the HEAD of your HTML document 2. Add the last code into the BODY of your HTML document --> <!-- STEP ONE: Paste this code into the HEAD of your HTML document --> <HEAD> <SCRIPT LANGUAGE="JavaScript"> <! > <! > <!-- Begin var rootparti; var rootpart; var det; var rootparti1; var rootparti2; var a; var b; var c; var x1; var x2; var i = "i"; function checkQuad() { var a = document.fquad.fa.value; var b = document.fquad.fb.value; var c = document.fquad.fc.value; if (a == 0 && c != 0) { x1 = -c / b; x2 = "Not a quadratic equation, but here is your answer for x"; document.fquad.x1.value=x1; document.fquad.x2.value=x2; } else if (a == "" && c != 0) { x1 = -c / b; x2 = "Not a quadratic equation"; document.fquad.x1.value=x1; document.fquad.x2.value=x2; } else { quad(); } } function quad() { var a = document.fquad.fa.value; var b = document.fquad.fb.value; var c = document.fquad.fc.value; det = Math.pow(b,2) - 4 * a * c; rootpart = Math.sqrt(det) / (2 * a); rootparti = (Math.sqrt(-det) / (2 * a)) + i; if (parseFloat(rootparti) < 0) { rootparti1 = rootparti; rootparti2 = (-1 * parseFloat(rootparti)) + i; } else { rootparti1 = (-1 * parseFloat(rootparti)) + i; rootparti2 = rootparti; } if (rootparti1 == "1i") { rootparti1 = i; rootparti2 = "-i"; } else if (rootparti1 == "-1i") { rootparti1 = "-i"; rootparti2 = i; } if (det == 0) { x1 = x2 = -b / (2 * a); } else if (det > 0) { x1 = (-b + Math.sqrt(det)) / (2 * a); x2 = (-b - Math.sqrt(det)) / (2 * a); } else if ((-b / (2 * a)) == 0) { x1 = rootparti1; x2 = rootparti2; } else { x1 = (-b / (2 * a) + " + " + rootparti1); x2 = (-b / (2 * a) + " + " + rootparti2); } document.fquad.x1.value=x1; document.fquad.x2.value=x2; } // End --> </script> </HEAD> <!-- STEP TWO: Copy this code into the BODY of your HTML document --> <BODY> <form name=fquad> <table> <tr> <td> <h2> <input name=fa size=4> x<SUP>2</SUP>+ <input name=fb size=4> x + <input name=fc size=4> = 0 <input type=button value="Solve" onClick="checkQuad()"> <input type=reset value="Reset"> </h2> </td> </tr> <tr> <td> <h2> x<sub>1</sub>=<input name=x1 size=45> <br> x<sub>2</sub>= <input name=x2 size=45> </h2> </td> </tr> </table> </form> <!-- Script Size: 2.77 KB -->