bonjour
d 1 ( 0) = 0 et d 1 ( 1 ) = 1
( 1 - 0 ) / ( 1 - 0) = 1 /1 = 1 donc ax = x
f (x) = x
d2 ( 0 ) = 0 et d 2 ( 1)= 0 .5
( 0.5 - 0 ) / ( 1 - 0) = - 0.5 donc ax = - 0.5 x
f (x) = - 0.5 x
d 3 ( 0) = 0 et d 3 ( - 1 ) = 2
( 2 - 0 ) / ( - 1 - 0 ) = - 2 donc ax = - 2 x
f (x) = - 2 x
