Sagot :
Réponse:
exercice 1: 2x×3x+2x×(-2)
=6x^2-4x
exercice 2: 2(3x)+3×x+3×(-1)
=2(3x) +3x-3
=2×3x+3x-3
= 6x+3x-3
=9x-3
exercice 3: 3. 2×1+2×(-x)+2x×1+2x×(-x) -3×1 -3×(-x)
=2-2x +2+2x-3+3x
= 5x+1
4. b×a+b×3+2×a+2×3
= ab+3b+2a+6
Réponse:
exercice 1: 2x×3x+2x×(-2)
=6x^2-4x
exercice 2: 2(3x)+3×x+3×(-1)
=2(3x) +3x-3
=2×3x+3x-3
= 6x+3x-3
=9x-3
exercice 3: 3. 2×1+2×(-x)+2x×1+2x×(-x) -3×1 -3×(-x)
=2-2x +2+2x-3+3x
= 5x+1
4. b×a+b×3+2×a+2×3
= ab+3b+2a+6