Mathematik • Bruchrechnung

Calcolatore di Frazioni con Semplificazione e Passaggi

Somma, sottrai, moltiplica e dividi frazioni online con calcolo del minimo comune multiplo (mcm) e riduzione ai minimi termini.

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Prima Frazione
Operazione
Seconda Frazione
Nota: È possibile utilizzare sia la virgola (,) che il punto (.) come separatore decimale.

Spiegazione Matematica

Ein Bruch stellt einen Teil eines Ganzen oder das Verhältnis zweier ganzer Zahlen dar. Er besteht aus dem Zähler (oben) und dem Nenner (unten).

Die 4 Grundrechenarten bei Brüchen:

  • Addition & Subtraktion: Ungleichnamige Brüche müssen zuerst auf einen gemeinsamen Hauptnenner (das kleinste gemeinsame Vielfache kgV) erweitert werden. Anschließend werden die Zähler addiert bzw. subtrahiert.
  • Multiplikation: Zähler wird mit Zähler und Nenner mit Nenner multipliziert: (a/b) × (c/d) = (a×c)/(b×d).
  • Division: Man multipliziert mit dem Kehrwert des Divisors: (a/b) ÷ (c/d) = (a/b) × (d/c) = (a×d)/(b×c).

Klammern & Rangfolge der Rechenarten (Punkt vor Strich):

Enthält ein Bruchterm mehrere Operationen oder Klammern wie (1/2 + 2/3) × (3/4 - 1/6), gelten die mathematischen Prioritätsregeln:

  1. Klammern zuerst: Ausdrücke in Klammern werden zuerst berechnet und zu einem Bruch zusammengefasst.
  2. Punkt vor Strich: Multiplikation (×) und Division (÷) binden stärker als Addition (+) und Subtraktion (-).
  3. Gleichrangige Operationen von links nach rechts: Mehrere Additionen/Subtraktionen oder Multiplikationen/Divisionen werden der Reihe nach von links nach rechts abgearbeitet.

Origine Storica e Sfida Risolta

Perché è stata sviluppata questa matematica, da dove proviene e quale problema reale ha risolto?

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Epoche & ZeitalterAncient Egypt & Babylon (c. 2000 – 1650 BCE)
Pioniere: Egyptian Scribes (Rhind Mathematical Papyrus, Ahmes)

1. Fair Distribution of Bread & Grain Rations

How do you divide 7 loaves of bread equally among 10 pyramid construction workers without anyone feeling cheated? Whole integers were insufficient for complex rationing and storehouse administration.

2. Unit Fractions & Common Denominators

Scribe Ahmes documented rational arithmetic in the Rhind Papyrus (1650 BCE), decomposing fractions into unit fractions (e.g. 7/10 = 1/2 + 1/5). Later mathematicians developed lowest common denominators to add and multiply arbitrary fractions.

3. Music Theory, Clock Ratios & Computer Science

Musical tuning systems (frequency ratios 3/2, 4/3), mechanical gears, and exact rational arithmetic in computer algebra systems rely on fraction theory.

„Accurate reckoning is the gate to knowledge of all things and dark mysteries.“ — Scribe Ahmes

Applicazioni nel Mondo Reale e Casi Pratici

Perché lo impariamo? Ecco come questa matematica viene applicata nell'economia, ingegneria, scienza e vita quotidiana:

Carpentry & Manufacturing

Material Cutting Without Waste

Woodworkers and machinists divide panels and beams into precise fractional parts to ensure perfect joint fits and minimize offcut scrap.

Praxis-Beispiel:

Dividing a 2 1/2 meter board into 4 equal segments equals (5/2) / 4 = 5/8 meter = 62.5 cm per piece.

Music & Acoustics

Note Values & Time Signatures

Musicians and composers structure songs using note fractions (whole, half, quarter, eighth, sixteenth) and meter signatures like 3/4 or 6/8.

Praxis-Beispiel:

A 4/4 measure can be composed of one half note (1/2) and two quarter notes (2 * 1/4): 1/2 + 2/4 = 1.

Chemistry & Pharmacy

Mixing Ratios & Serial Dilutions

Laboratories prepare chemical solutions with exact compound ratios by utilizing fractions for solute and solvent concentrations.

Praxis-Beispiel:

A 1:4 dilution ratio (1/5 concentrate and 4/5 water) requires exactly 1 liter of concentrate for a 5-liter total mixture.

Domande Frequenti (FAQ)

Come si sommano frazioni con denominatore diverso?

Si calcola il minimo comune multiplo dei denominatori, si portano entrambe le frazioni allo stesso denominatore e si sommano i numeratori.

Come si dividono due frazioni?

Si moltiplica la prima frazione per l'inverso (reciproco) della seconda frazione.