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bonjour aidez moi svppp il faut resoudre ces équations je ne comprends rien 1) 6t - 9 = 2t + 11 2) 9u – 6 = -5u + 8
3) (3x + 6) (2x – 6) = 0 4) ( 2t – 4) + ( 6t + 9) = 0

Sagot :

MAUDMARINE

Bonjour,

Résoudre ces équations :

1) 6t - 9 = 2t + 11  

6t - 2t = 11 + 9

4t = 20

t = 20/4

t = 5

2) 9u – 6 = -5u + 8

9u + 5u = 8 + 6

14u = 14

u = 14/4

u = 1

3) (3x + 6) (2x – 6) = 0

3x + 6 = 0           ou           2x - 6 = 0

3x = - 6                              2x = 6

x = - 6/3                              x = 6/2

x = - 2                                 x = 3

4) ( 2t – 4) + ( 6t + 9) = 0

2t - 4 + 6t + 9 = 0

2t + 6t = 4 - 9

8t = - 5

t = - 5/8.

Hello,

6t - 9 = 2t + 11

6t - 2t = 11 + 9

4t = 20

t = 20/4 = 5

9u - 6 = -5u + 8

9u + 5u = 8 + 6

14u = 14

u = 14/14 = 1

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

3x + 6 = 0

3x = -6

x = -6/3 = -2

et

2x - 6 = 0

2x = 6

x = 6/2 = 3

(2t - 4) + (6t + 9) = 0

2t - 4 + 6t + 9 = 0

8t + 5 = 0

8t = -5

t = -5/8