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Sagot :

D= (3x)² + 7² + 2 x 3x x 7

  = 9x² + 49 + 42x

 

E= 6² + (9x)² - 2 x 9x x 6

  = 36 + 81x² - 108x

 

F= 10² - (7z)²

NINOUU

D= 3x²+2*3x*7+7²

D= 9x²+42x+49


F= 6²-2*6*9x+9x²

F= 36-108x+81x²


E= 10²-7z²


Voilà.

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