Qui pourrais m'aider pour les 2 svp

bonjour

A = x² - 6 x + 9 - ( x - 2 x² - 3 + 6 x )

= x² - 6 x + 9 - x + 2 x² + 3 - 6 x

=  3 x² - 13 x + 12

C = 5/3 - 20/21

=  35/21 - 20/21

= 15 /21

= 5 / 7

Bonjour,

A=(x-3)²-(x-3)(1-2x)

  =x²-6x+9-(x-2x²-3+6x)

  =x²-6x+9+2x²-7x+3

A=3x²-13x+12

C=5/3 - 4/7 * 5/3

  =5/3 - (4*5)/(7*3)

  =5/3 - 20/21

  =35/21 - 20/21

  = (35-20)/21

  =15/21

C= 5/7