Bonjour svp aider moi =) Calculer la valeur des expressions littérales suivantes pour x = 3. A = 5 (x2 + 3) - x B = 4x2 + 2x + 3 C = 2 (4x2 + x + 3)

bjr

5(3² + 3) - 3 = 5(9 + 3) - 3 = 5 * 12 - 3 = 60 - 3 = 57.

4 * 3² + 2 * 3 + 3 = 4 * 9 + 6 + 3 = 36 + 9 = 45.

2(4 * 3² + 3 + 3) = 2(4 * 9 + 6) = 2(36 + 6) = 2 * 42 = 84.

A=5×(3^2+3)-3

=5×(3×3+3)-3

=5×(9+3)-3

=5×12 -3

=60-3

=57

B=4×3^2+2×3+3

=4×3×3+6+3

=4×9+6+3

=36+6+3

=42+3

=45

C=2×(4×3^2+3+3)

=2×(4×3×3+3+3)

=2×(4×9+3+3)

=2×(36+3+3)

=2×(39+3)

=2×42

=84

Explications :Remplacer X par sa valeur