Réponse :
Bonsoir,
Explications étape par étape
ex 63
1) 4/7 x (-7)/2 = 4 x (-7)/7 x 2 = 4 x ( -1 )/ 2 = -4/2 = -2
2) 11/6 - (-5/3) = 11 /6 + 5/3 = 11/6 + 10/6 = 21/6 = 7 x 3/3 x 2 = 7/2
3) 3/4 + (-7/2) = 3/4 -7/2 = 3/4 - 14/4 = -11/4
4) -7/2 / 3/4 = -7/2 x 4/3 = -28/6 = -7 x 2 x 2/ 3 x 2 = - 14/3