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Sagot :

VINS

re

a + b = 1

a - b = 5

a =   1 - b  

on remplace a

1 - b  - b = 5

- 2 b = 5 - 1

- 2 b = 4

b = - 2

a - 2 = 1

a = 1 + 2

a = 3

CD = - 15

- 1 x 15 = - 15

- 3 x 5 = - 15

- 15  x 1 = - 15

-  5 x 3 = - 15

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