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Sagot :

Explications étape par étape:

C= 3(5x+6)+8(3-2x)

=3×5x+3×6+8×3+8×(-2x)

=15x+18+24-16x

=-x+42

D=2(3x+4)-4(5x-6)

=2×3x+2×4-4×5x-4×(-6)

=6x+8-20x+24

=-14x+32

Bonjour

C = 3 (5x + 6) + 8 (3 - 2x)

C = 15x + 18 + 24 - 16x

C = 15x - 16x + 18 + 24

C = - x + 42

D = 2 (3x + 4) - 4 (5x - 6)

D = 6x + 8 - 20x + 24

D = 6x - 20x + 8 + 24

D = - 14x + 32

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