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Exercice 5

A=5-2^3

=5-2×2×2

=5-8

=-3

A=-3

B=3^2 - 3 × (5 -3^4)

=3 ×3 -3(5-3×3×3×3)

=9-3(5-81)

=9 -15+243

B=237

C=3 × 4^2 - 3^2 × 2

=3 ×16 - 9 × 2

=48-18

C=30