Saluut, j'ai un exercice mais je suis nul en math: Calculer, puis mettre le resultat sous la forme d'une fraction irréductible:
1. A= (1/3 - 5/4) × 4/33

2. B=3/5 - 5/7 × 21/10

3. C=(4/9 - 1/6) ÷ 5/9

Merci d'avance.
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