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Sagot :

1) A = -2 x 3 + 7
= 7 - 6
= 1

A = -2 x 5 + 7
= 7 - 10
= - 3

A = - 2 x 2 + 7
- - -
1 3 1
= 4 + 21
- -
3 3
= 25
-
3

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