Sagot :
Réponse :
bonjour
1) 2x (4 - 3x) = 8 x - 6 x²
2) - 1 + 2 (2 + x) = - 1 + 4 + 2 x = 2 x + 3
3) 4 (x -3) - 4x + 17 = 4 x - 12 - 4 x + 17 = 5
4) 2 (x - 4) + 5 (9 - 3x) = 2 x- 8 + 45 - 15 x = - 13 x + 37
5) x (x - 3) = x² - 3 x
6) 3 - 2x + 4 + 4x = 2 x + 7
7) 9 - 4x - 9 + 7x = 3 x
8) 3 (x - 1) = 3 x - 3
9) 4x + 3 - 7x + 9 = - 3 x + 12
Explications étape par étape
Salut !
2x(4-3x) = 2x*4+2x*(-3x) = 8x-6x²
-1+2(2+x) = -1+2*2+2*x = -1+4+2x = 3+2x
4(x-3)-4x+17 = 4*x+4*(-3)-4x+17 = 4x-12-4x+17 = 5
2(x-4)+5(9-3x) = 2*x+2*(-4)+5*9+5*(-3x) = 2x-8+45-15x = -13x+37
x(x-3) = x*x+x*(-3) = x²-3x
3-2x+4+4x = 7+2x
9-4x-9+7x = 3x
3(x-1) = 3*x+3(-1) = 3x-3
4x+3-7x+9 = -3x+12