Réponse :
mots soulignés = Réponse
Explications étape par étape
a) 5/3 + -1/9
= 5x3/3x3 + -1/9
= 15/9 + -1/9
= 15-1/9
= 14/9
b) 5/13 + 4
= 5/13 + 4/1
= 5/13 + 4x13/1x13
= 5/13 + 65/13
= 5+65/13
= 70/13
c) 5/6 - -45/4 + 2/12
= 5x2/6x2 - -45x3/4x3 + 2/12
= 10/12 - -135/12 + 2/12
= 10-(-135)+2/12
= 147/12
d) 4/5 x 7/3
= 4x7/5x3
= 28/15
e) 8 x -5/9
= 8/1 x -5/9
= 8x(-5)/1x9
= -40/9
