Explications étape par étape:
lorque tu as ( ) × ( ) = 0 alors une des ( ) = 0
A: (4x +5) =0 ou (6x - 12) = 0
_ si 4x +5 = 0. 4x = -5 x = -5/4
_ si 6x - 12 = 0. 6x = 12 x = 12/6 = 2
B:
_ si x + 1/2 = 0 x = -1/2 = -0,5
_ si 2x - 2/3 = 0 2x = 2/3 x = (2/3)÷2
x = 2/3 × 1/2 x = 2/6= 1/3
C:
= (3x+2)(3× +2)
3x + 2 = 0 3x = -2 x = -2/3
D:
=(10 - 5x)(10-5x)(10-5x)
10 - 5x = 0 -5x = -10 x = -10/-5 = 10/5 = 2
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Explications étape par étape:
lorque tu as ( ) × ( ) = 0 alors une des ( ) = 0
A: (4x +5) =0 ou (6x - 12) = 0
_ si 4x +5 = 0. 4x = -5 x = -5/4
_ si 6x - 12 = 0. 6x = 12 x = 12/6 = 2
B:
_ si x + 1/2 = 0 x = -1/2 = -0,5
_ si 2x - 2/3 = 0 2x = 2/3 x = (2/3)÷2
x = 2/3 × 1/2 x = 2/6= 1/3
C:
= (3x+2)(3× +2)
3x + 2 = 0 3x = -2 x = -2/3
D:
=(10 - 5x)(10-5x)(10-5x)
10 - 5x = 0 -5x = -10 x = -10/-5 = 10/5 = 2