bjr
4+(x-3)×5
= 4 + 5*x + 5(-3) = 4 + 5x - 15 = 5x - 11
2x(x+1)-x = 2x*x + 2x* 1 - x = 2x² + 2x - x = 2x² + x
-(4-x)×2 = -2*4 - 2*(-x) = -8 + 2x = 2x - 8
3×(5x × 2)×4 = * au milieu de la ( ) ?? pas plutôt 5x + 2?
3×x + x×2x + 3×4 +2x×4
3x + 2x² + 12 + 8x
soit 2x² + 11x + 12
