Bonjour Qui pourrait m'aider et m'expliquer étape par étape merci

Bonjour,

a) -3/8 + 6/16 = -6/16 + 6/16 = 0

b) 15/2 ÷ (-5)/(-12) = 15/2 × 12/5 = 180/10 = 18

c) -14/25 ÷ -7/15 = -14/25 × (-15/7) = 210/175 = 1,2

d) 5/11 ÷ 15/66 = 5/11 × 66/15 = 330/165 = 2

a) -3/8 + 6/16 = -6/16 + 6/16 = 0

b) 15/2 ÷ (-5)/(-12) = 15/2 × 12/5 = 180/10 = 18

c) -14/25 ÷ -7/15 = -14/25 × (-15/7) = 210/175 = 1,2

d) 5/11 ÷ 15/66 = 5/11 × 66/15 = 330/165 = 2