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A = x² + 6 x - x = x² + 5 x

B = xy - 2 x + xy = 2 xy - 2 x

C = 3 x² + 12 x - 6 x² = - 3 x² + 12 x

D =  9 x ³ - 54 x + 2 x²

E = 15 x + 25 x² + 5 x + x² +  8 x² + 1  = 34 x² + 20 x + 1

F = 21 x² - 35 x - 48 x - 42 x² = - 21 x² - 83 x

termine le G

 

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