Mathématiques

Question

Pouvez vous m’aider pour cet exercice. Merci d’avance

Exercice 1
Résoudre les équations suivantes :
4x = 12
-&r= 34
x+8 = 15
X-5 = 15
3.x - 7= 23
-3.r + 2 = -19
5x - 8 = -10
4x - 7 = 2x + 13
-Gr + 3 = 3.x + 15
-7x + 8 = -4x + 12
(3.x - 6)(2x + 8) = 0
(5.x - 10)(3.x + 15) = 0
x(3.x - 7)(-2x + 4) = 0
(6x - 7)(-3.x - 9) = 0
r = 16
x = 15
19 + x2 = 100
3.x2 = 27
Exercise 3

1 Réponse

  • Réponse :

    bonjour

    4 x = 12

    x = 3

    - &r = ?

    x + 8 = 15

    x = 15 - 8

    x = 7

    x- 5 = 15

    x = 20

    3 x - 7 = 23

    3 x = 30

    x = 10

    - 3 r + 2 = - 19

    - 3 r = - 19 - 2

    - 3 r = - 21

    r = 7

    5 x - 8 = - 10

    5 x = - 10 + 8

    5 x = - 2

    x = - 2/5

    4 x - 7 = 2 x + 13

    4 x - 2 x = 13 + 7

    2 x = 20

    x = 10

    - Gr  ?

    - 7 x + 8 = - 4 x + 12

    - 7 x + 4 x = 12 - 8

    - 3 x = 4

    x = - 4/3

    ( 3 x - 6 ) ( 2 x + 8 ) = 0

    x =  6/3 = 2 ou  x = -  8/2 = - 4

    ( 5 x - 10 ) ( 3 x + 15 ) = 0

    x = 10/5 = 2 ou  x = - 15/3 = - 5

    x ( 3 x - 7 ) ( - 2 x + 4 ) = 0

    x = 0 ou x = 7/3 ou x =  - 2

    ( 6 x - 7 ) ( - 3 x - 9 ) = 0

    x = 7/6 ou  - 3

    r =  16

    x = 15

    19 + x² = 100

    x² = 100 - 19

    x² = 81

    x = √81 ou - √81

    x = 9 ou -  9

    3 x² = 27

    x² = 9

    x =  √9 ou - √9

    x = 3 ou - 3

    Explications étape par étape

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