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Sagot :

AYUDA

bjr

comme (a+b) (c+d) = ac + ad + bc + bd

on aura

= 9x*5x + 9x*4 - 3*5x - 3*4

et on calcule

= 45x² + 36x - 15x - 12

= 45x² + 21x - 12

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