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Sagot :

Explications étape par étape:

[tex] \frac{42}{14} = \frac{7 \times 3 \times 2}{7 \times 2} = 3 \\ \frac{56}{63} = \frac{8 \times 7}{9 \times 7} = \frac{8}{9} \\ \frac{189}{420} = \frac{9 \times 3 \times 7}{20 \times 3 \times 7} = \frac{9}{20} [/tex]

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