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Sagot :

Bonjour,

3x + 5x × (-2x) + x × 2 = 3x - 10x² + 2x = 5x - 10x²

2 + 3 × 4 - x - x = 2 + 12 - 2x = 14 - 2x

(-x) × (-x) + (-x) × x = x² - x² = 0

-3 × 2 + (x × 5) × 3 + x × 2x = 2x² + 15x - 6

Réponse :

bonjour

3x+5x×(-2x)+x×2=

3x-10x²+2x=-10x²+5x

2+3×4-x-x=

2+12-2x=

-2x+14

(-x)×(-x)+(-x)×x=

x²-x²=0

-3×2+(x×5)×3+x×2x=

-6+15x+2x²=

2x²+15x-6

Explications étape par étape

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