Bonsoir, je n'arrive pas à faire mon devoir de math. Pouvez-vous m'aider svp?

Réponse :

Explications étape par étape

Bonjour

Calculer :

-3/5 + 9/20

= (-3 x 4)/(5 x 4)

= (-12/20) + 9/20

= (-3/20)

5/12 - 3/8

= (5 x 2)/(12 x 2) - (3 x 3)/(8 x 3)

= 10/24 - 9/24

= 1/24

-2 - (-4/3)

= -2 + 4/3

= (-2 x 3)/3 + 4/3

= -6/3 + 4/3

= (-2/3)

-8/9 : 7/4

= -8/9 x 4/7

= (-8 x 4)/(9 x 7)

= -32/63

11/3 : (-5/4)

= 11/3 x -4/5

= (-4 x 11)/(3 x 5)

= (-44/15)

(-2/15 + 3/5) : (-2 + 3/10)

= (-2/15 + (3 x 3)/(5 x 3)) : ((-2 x 10)/10 + 3/10)

= (-2/15 + 9/15) : (-20/10 + 3/10)

= 7/15 : (-17/10)

= 7/15 x -10/17

= (-10/15) x 7/17

= (-2 x 5)/(3 x 5) x 7/17

= -2/3 x 7/17

= (-2 x 7)/(3 x 17)

= (-14/51)