Bonjour,
f(2/3) = 1/4 X (2/3) - 1/2
f(2/3) = 2/12 - 1/2
f(2/3) = 1/6 - 1/2
f(2/3) = 1/6 - (1x3)/(2x3)
f(2/3) = 1/6 - 3/6
f(2/3) = -2/6
1/4x - 1/2 = 0
1/4x = 1/2
x = (1/2) / (1/4)
Or, on sait que diviser c’est multiplier par l’inverse.
x = 1/2 x 4/1
x = 4/2
x = 2
