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Sagot :

Bonsoir :)

Développer puis réduire chaque expression :

A = 3(x - 2) + 5(3 - x)

A = 3x - 6 + 15 - 5x

A = 3x - 5x - 6 + 15

A = -2x + 9

B = x(3 + x) - 2(x + 5)

B = 3x + x² - 2x - 10

B = x² + 3x - 2x - 10

B = x² + x - 10

C = -2(x - 7) - 2(x² + x) + 4(x² + 1)

C = -2x + 14 - 2x² - 2x + 4x² + 4

C = -2x² + 4x² - 2x - 2x + 14 + 4

C = 2x² - 4x + 18

D = 2x(-x + 5) - x²(1 - x)

D = -2x² + 10x - 1x² + x³

D = x³ - 3x² + 10x

E = -6x(2x² - 3x) - 3(x + 4x²) - x(-3 + 4x)

E = -12x³ + 18x² - 3x - 12x² + 3x - 4x²

E = -12x³ + 18x² - 12x² - 4x² - 3x + 3x

E = -12x³ + 2x²

Bonne soirée :)

JODEVI

Note : (2) ça veut dire au carré,(3) au cube

A = 3(x-2)+5(3-x)

    = 3x-3*2+5*3-5x

    = -2x-6+15

    = -2x + 9

B = x(3+x)-2(x+5)

   = 3x+x*x-2x-2*5

    = x(2) + x -10

c = -2(x-7)-2(x(2) + x) + 4(x(2)+1)

  = -2x -2*-7 -2x(2) -2x +4x(2) + 4*1

   = -2x(2)+4x(2) -2x-2x +14+4

  = 2x(2) -4x +18

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

   = 2x*-x +2x*5 -x(2)*1 -x(2)*-x

   = x(3) -2x(2)-x(2) +10x

   = x(3) -3x(2) +10x

E = -6x(2x(2)-3x)-3(x+4x(2))-x(-3+4x)

  = -6x*2x(2) -6x*-3x -3*x -3*4x(2) -x*-3 -x*4x

  = -12x(3) +18x(2) -3x -12x(2) +3x -4x(2)

  = -12x(3) +2x(2)

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