bonsoir
f ( 2/7 ) = 4 alors f (x) = 4 : 2/7 = 4 x 7/2 = 28/2 = 14
f ( - 5/6 ) = - 8/5 alors f (x ) = - 8/5 x - 6 /5 = 48/25
f ( 6 ) = 4 alors f (x) = 4 /6 = 2 /3 alors f ( 15 ) = 30/3 = 10
f ( 8 ) = 2.4 alors f (x) = 2.4 /8 = 0.3 et 0.3 x = - 1.8 donc antécédent= - 6
f ( - 4 ) = 5 donc f (x) = - 5/4 donc f ( 3 ) = - 15 /4 = - 3.75
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bonsoir
f ( 2/7 ) = 4 alors f (x) = 4 : 2/7 = 4 x 7/2 = 28/2 = 14
f ( - 5/6 ) = - 8/5 alors f (x ) = - 8/5 x - 6 /5 = 48/25
f ( 6 ) = 4 alors f (x) = 4 /6 = 2 /3 alors f ( 15 ) = 30/3 = 10
f ( 8 ) = 2.4 alors f (x) = 2.4 /8 = 0.3 et 0.3 x = - 1.8 donc antécédent= - 6
f ( - 4 ) = 5 donc f (x) = - 5/4 donc f ( 3 ) = - 15 /4 = - 3.75