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Exercice 95 :
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Enoncé :
Simplifiez les fractions suivantes :
\( \dfrac{15}{25} \)
\( \dfrac{18}{30} \)
\( \dfrac{28}{42} \)
\( \dfrac{35}{49} \)
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Solution :
\(\dfrac{15}{25} = \dfrac{5\times 3}{5\times 5} = \dfrac{3}{5}\)
\(\dfrac{18}{30} = \dfrac{6\times 3}{6\times 5} = \dfrac{3}{5}\)
\(\dfrac{28}{42} = \dfrac{14\times 2}{14\times 3} = \dfrac{2}{3}\)
\(\dfrac{35}{49} = \dfrac{7\times 5}{7\times 7} = \dfrac{5}{7}\)