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Sagot :

AYUDA

on additionne donc

1 - 2x et 5x - 2

et on aura

= 1 - 2x + 5x - 2

= - 2x + 5x + 1 - 2

= 3x - 1

au milieu on aura

5x - 2 + (-3x + 2)

= 5x - 1 - 3x + 2

= 5x - 3x - 1 + 2

= 2x + 1

etc

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