Réponse :
J= (1/2-3/4) * 4/9 = ((2-3)/4)* 4/9 = -1/4*4/9 = -1/9
K= 1/2 - 3/4 * 4/9 = 1/2 - 3/9 = 1/2 - 1/3 = (3-2)/6 = 1/6
L= 1/5 - 3/5 * 1/6 +1/2 = 1/5 -3 /30 +1/2 = 1/5 -1/10 +1/2 = (2-1 + 5)/10 = 6/10
M = (1/5 - 3/10) - (1/6 -1/2) = (2-3)/10) - (1-3)/6 = -1/10 +2/6 = (-3+10)/30 =7/30
Explications étape par étape
