a=(3/5-1/4)/(1+2/5)
voila ce que je dois calculer sous formes de fractions irréductible merci
a= (3/5-1/4)/(1+2/5)
= (3x4/5x4 - 1x5/4x5) / (1x5/1x5 + 2/5)
= 12-5 / 20
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5+2 / 5
= 7/20
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7/5
= 7/20 x 5/7
= 1/4 x 1/1
= 1/4