Exercice 3: 3( A=3(5x – 6); B=5x2+6 Calculer ces expressions pour 1)x=4 2)x=1.5 3)x=-3​

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Pour x = 4,2

A = 3(5×4,2-6)

A = 3(21-6)

A = 3×15

A = 45

B = 5×4,2×2+6

B = 42+6

B = 48

Pour x = 1,5

A = 3(5×1,5-6)

A = 3(7,5-6)

A = 3×1,5

A = 4,5

B = 5×1,5×2+6

B = 15+6

B = 21

Pour x = -3

A = 3(5×(-3)-6)

A = 3(-15-6)

A = 3(-21)

A = -63

B = 5×(-3)×2+6

B = -30+6

B = -24

Voilà !