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Sagot :

MARGESIMPSON1

Bsr

Développer et réduire :

A = 8(-2x+9)

A = -8×2x+8×9

A = -16x+8×9

A = -16x+72

B = (x+2)(x-3)

B = x×x-3x+2x-2×3

B = x²-3x+2x-2×3

B = x²-3x+2x-6

B = x²-x-6

C = (-3x+7)(4x-1)

C = -3x×4x-3x(-1)+7×4x-7

C = -12x²-3x(-1)+7×4x-7

C = -12x²+3x×1+7×4x-7

C = -12x²+3x+7×4x-7

C = -12x²+3x+28x-7

C = -12x²+31x-7

D = (-3x+1)(-5x+2)

D = -3x(-5x)-3x×2-5x+2

D = 3x×5x-3x×2-5x+2

D = 15x²-3x×2-5x+2

D = 15x²-6x-5x+2

D = 15x²-11x+2

Bonne fin d'année !

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