什么是剰余の定理計算機?
- 簡単な説明:多項式を除算するかどうかを示す規則f(x)線形除数によって× - c、その除算の残りは、単に評価することとまったく同じです。f(c).
- 3 次方程式で重要な理由:これにより、学生は多くの潜在的なルートを安全に迅速にテストできます。もしf(c)がゼロに等しい場合、完全な根因数が見つかりました。
実根および複素根を備えた専用の三次方程式ソルバー、Cardano メソッドのステップ、三次グラフ作成、および実際の例。
剰余の定理計算機
上に多項式係数を入力し、「f(c) を評価する」をクリックして結果を表示します。The Remainder Theorem states that when a polynomial f(x) is divided by a linear divisor (x − c), the remainder is exactly f(c). This means you can evaluate any polynomial at any point simply by performing synthetic division — the last number in the bottom row equals f(c).
The Factor Theorem is a direct corollary: if f(c) = 0, then (x − c) is a factor of f(x). These two theorems together provide a powerful bridge between evaluation and factoring. Instead of plugging in values manually (which involves large exponents), synthetic division gives the same answer with simpler arithmetic.
For cubic equations, the Remainder Theorem is especially useful for root verification. After finding candidate roots via the Rational Root Theorem, you can quickly confirm which ones are actual roots by checking whether f(c) = 0. This is faster and less error-prone than direct substitution, particularly for large coefficients.
Evaluate f(c) for any value c without computing large powers directly — synthetic division handles it cleanly.
After finding candidate roots, the Remainder Theorem instantly confirms which candidates are actual roots.
The theorem beautifully connects the concepts of division, evaluation, and factoring into one unified framework.
When dividing by (x+3), the evaluation point is c = −3, not c = 3. The theorem uses (x MINUS c).
The Remainder Theorem is not limited to cubics. It works for polynomials of any degree.
The remainder from division equals f(c). Don't confuse the quotient (a polynomial) with the remainder (a number).
| Theorem | f(x) ÷ (x−c) has remainder f(c) |
| Factor Test | f(c) = 0 means (x−c) is a factor |
| Method | Use synthetic division for efficiency |
| Works For | Polynomials of any degree |
| Key Benefit | Avoids computing large powers directly |
合成除算では、余った商 2 次 * と * 剰余が得られます。このツールは商をバイパスし、純粋に余りを返します。
はい!残り<span class="font-mono text-primary-700 bg-primary-50 px-1 rounded">R</span>文字通り、<span class="font-mono text-primary-700 bg-primary-50 px-1 rounded">y</span>-グラフ上の座標を指定するとき<span class="font-mono text-primary-700 bg-primary-50 px-1 rounded">x = c</span>.
おめでとう!因数定理を通じて方程式の根を見つけました。
因数定理は剰余定理の特殊なケースです。剰余 f(c) = 0 の場合、(x - c) は多項式の因数です。
はい、剰余定理は 3 次だけでなく、あらゆる次数の多項式に対して機能します。これは、多項式の値を評価するための汎用ツールです。