Bonjour,
Dans chaque cas développe et réduis :
A=8 ( x - 3 )
A = 8x - 24
B=4 ( 2x + 5 )
B = 8x + 20
C= (2 - x) × 3
C = - 3x + 6
D= 2 ( 3x - 4 )
D = 6x - 8
E= 5 (1 - 2x )
E = 5 - 10x
F= ( 3x +7 ) ×5
F = 15x + 35
Bonjour,
a(x + b) = a * x + a * b = ax + ab
a(x - b) = a * x + a * -b = ax - ab
8(x - 3) = 8 * x + 8 * - 3 = 8x - 24
4(2x + 5) = 4 * 2x + 4 * 5 = 8x + 20
3(2 - x) = 3 * 2 + 3 * - x = -3x + 6
2(3x - 4) = 2 * 3x - 4 * 2 = ......
5(1 - 2x) = 5 * 1 + 5 * -2x = .......
5(3x + 7) = 5 * 3x + 7 * 5 = 15x + 35