bonjour
f (x) = 2 x /5 - 3/10
f ( - 1/2) = (2 * - 1/2 ) / 5 - 3 /10 = - 1 /5 - 3 /10 = - 2/10 - 3 /10 = - 5 /10 = - 1/2
f ( 3/4) = ( 2 *3/4) / 5 - 3 /10 = 6/4 x 1/5 - 3/10 = 6/20 - 3/10 = 6/20 - 6/20 = 0
f (2) = 4/5 - 3 /10 = 8/10 - 3/10 = 5/10 = 0.5 → ∉ à la courbe
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bonjour
f (x) = 2 x /5 - 3/10
f ( - 1/2) = (2 * - 1/2 ) / 5 - 3 /10 = - 1 /5 - 3 /10 = - 2/10 - 3 /10 = - 5 /10 = - 1/2
f ( 3/4) = ( 2 *3/4) / 5 - 3 /10 = 6/4 x 1/5 - 3/10 = 6/20 - 3/10 = 6/20 - 6/20 = 0
f (2) = 4/5 - 3 /10 = 8/10 - 3/10 = 5/10 = 0.5 → ∉ à la courbe