bonjour
f ( 0 ) = 6 et f ( 7 ) = 0
( 0 - 6 ) : ( 7 - 0 ) = - 6 /7
ax = - 6 x /7
f ( 0 ) = 6 donc b = 6
f (x) = - 6 x /7 + 6
d'où f ( 7 ) = - 42 /7 + 6 = - 6 + 6 = 0
g (0 ) = 2 et g ( 4) = 4
( 4 - 2 ) : ( 4 - 0 ) = 2 /4 = 1 /2
ax = x /2
g (0) = 2 donc b = 2
g (x) = x /2 + 2
g ( 4 ) = 4 /1/2 + 2 = 4/2 + 2 = 4
h ( 0) = 1 et h ( 5 ) = 0
( 0 - 1 ) : ( 5 - 0 ) = - 1 /5
ax = - x /5
b = 1
g (x) = - x /5 + 1
g ( 3 ) = 8 et g ( 5 ) = - 2
( - 2 - 8 ) : ( 5 - 3 ) = - 10/2 = - 5
ax = - 5 x
g (3) = 8
3 * - 5 + b = 8
-15 + b = 8
b = 8 + 15 = 23
g (x) = - 5 x + 23
