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aire ABCD  

x  ( x +  2 ) = x² + 2 x

A =  6 x² - 4 x + 15 x - 10  = 6 x² + 11 x - 10

B =  36 x² - 84 x + 49

C =  20 - 15 x - 8 x + 6 x² = 6 x² - 23 x + 20

d = 3 ( x + 7 )

E =  8 x ( 5 x + 1 )

F =  5 b ( 3 a - 5 b + c )

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