Sagot :
(x-3)²-(x-1)(x-2)
x²-2 x X x 3+3²- ( x-1) ( x-2)
x²-6x +9 - ( x²-2x - 1x+2 )
x²-6x+9+x²+3x-2
2x²-3x+7
et voila melanie
x²-2 x X x 3+3²- ( x-1) ( x-2)
x²-6x +9 - ( x²-2x - 1x+2 )
x²-6x+9+x²+3x-2
2x²-3x+7
et voila melanie