aidez moi s'il vous plaît ​exercice fraction linéaire

Réponse :

EXERCICE 1

f:x  = 5x

a) f(2) = 5*2=10

b) f(x) : 5x = 50          x = 50/5 = 10

c) *f(20) = 5(20) = 100

*f(x) = 5          5x = 5          x = 5/5 = 1

EXERCICE 2

g:x = -3x

a) g(3) = -3(3) = -9

b) g(x) = 12          -3x = 12          x = 12/-3 = -4

c) *g(5) = -3(3) = -9

*g(x) = -9          -3x = -9          x = 9/3 = 3

EXERCICE 3

f:x = -4x

a) f(32) = -4(32) = -128

b) f(x) = -16          -4x = -16          x = -16/-4 = 4          

c) *f(-2) = -4(-2) = 8

*f(x) = 4          -4x = 4          x = 4/-4 = -1          

EXERCICE 4

f: x = 2,4x

a) f(3) = 2,4(3) = 7,2

b) f(x) = - 15           2,4x = - 15          x = -15/2,4 = -150/24 = -5/8

EXERCICE 5

f : x = -7x

a) f(-5,2) = -7(-5,2) = 36,4

b) f(x) = -49          -7x = -49          x = 49/7 = 7

EXERCICE 6

f : x = x/3

a) f(-9) = 9/3 = 3

b) f(x) = -12          x/3 = - 12          x = -12/(1/3) = -12*3 = -36

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