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Bonjour aidez-moi svp c'est des maths je suis en 3ᵉ

Exercice : Équation nul

1) (2x - 1 ) ^2 = 0
2) (3 - 2x ) X (1 + 5x ) = 0
3) (3 - x ) + ( 7 x + 1 ) = 0

Sagot :

MAUDMARINE

Bonsoir

1) (2x - 1 ) ^2 = 0

2x - 1 = 0

2x = 1

x = 1/2

2) (3 - 2x ) X (1 + 5x ) = 0

3 - 2x = 0                ou           1 + 5x = 0

- 2x = - 3                                 5x = - 1

x = 3/2                                     x = 1/5

3) (3 - x ) + ( 7 x + 1 ) = 0

3 - x + 7x + 1 = 0

- x + 7x = - 1 - 3

6x = - 4

x = - 4/6

x = - 2/3

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