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Sagot :

Ex19:
1) F(x) = -3,5x
Si x= 1
F(1)= -3,5x1
F(1)= -3,5

2)
x | 0 -1 2,4 0,16 -0,11
Image | 0 3,5 -8,4 -21 31,5

Ex 20:
f(2/3) = 21/4 x 2/3
= (21x2) / (4x3)
=42/12
=7/2

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