Calculer A en détaillant les étapes du calcul et écrire le résultat sous la forme d'une fraction irréductible:2/5-4/5 ;14/30*-65/42 et 2-2*8/5
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2/5 -4/5 = -2/514/30 x -65/42
14/ 5*6 x - 13*5 / 14*3
-13 /18
2-2*8/5
2 -16/5
10/5 -16/5
-6/5
14/30*(-65/42)=[(2*7)/(2*15)]*[(-5*13)/(6*7)]
=[7/(3*5)]*[(-5*13)/(6*7)]
=(-5*7*13)/(3*5*6*7)
=(-13)/(3*6)
=(-13/18)
2-2*8/5=2-16/5
=(2*5)/5-16/5
=10/5-16/5
=(-6/5)