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Sagot :

VINS

bonjour

A =  15 x² - 15 x - 6 x² + 9

   =  9 x² - 15 x + 9

B = 20 x - 8 x² + 15 - 6 x - 20 x² + 28 x

  =  - 28 x² + 42 x + 15

C =   20 x² - 8 x - 15 x + 6 - ( 21 x - 6 x² + 49 - 14 x )

  = 20 x² - 23 x + 6 - 21 x + 6 x² - 49 + 14 x

  =  26 x²  -30 x - 43

d =  9 x² + 24 x + 16

F =  3 x² / 7 + 3 x / 9 - 2 x /21 - 2 /27

  =   81 x² / 189 + 63 x / 189 - 18 x /189 -  14/189

   =  81 x² + 45 x - 14

MAHAM

Réponse :

bonjour

Explications étape par étape

A = 3x(5x-5)-3(2x²-3)

A = 15x²-15x-6x²+9

A = 9x²-15x+9

B = (4x+3)(5-2x)-4x(5x-7)

B = 20x-8x²+15-6x-20x²+28x

B = -28x²+42x+15

C = (4x-3)(5x-2)-(3x+7)(7-2x)

C = 20x²-8x-15x+6-(21x-6x²+49-14x)

C = 20x²-23x+6 +6x²-7x-49

C = 26x²-30x-43

D  = (3x+4)²

D = 9x²+24x+16

F = (3x-2/3)(x/7+1/9)

F = 3x²/7+3x/9-2x/21-2/27

F = 3x²/7 +5x/21-2/27

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