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