Bonjour
Développer et reduire
3x (x au carré -2)-x (2x-1) =
3x^3 - 6x - 2x^2 + x =
3x^3 - 2x^2 - 5x
(1-2x)(1+2x)-2 (-3x+7)(x-2) =
1 - 4x^2 - 2(-3x^2 + 6x + 7x - 14) =
1 - 4x^2 + 6x^2 - 26x + 28 =
2x^2 - 26x + 29
(2-x) au cube =
(2 - x)(2 - x)^2 =
(2 - x)(4 - 4x + x^2) =
8 - 8x + 2x^2 - 4x + 4x^2 - x^3 =
-x^3 + 6x^2 - 12x + 8