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Sagot :

VINS

bonjour

0.5 x² - 1 - ( 2 x - 3 )

=  0.5 x² - 1 - 2 x + 3

= 0. 5x² - 2 x + 2

0.5 ( x - 2 ) ² = 0.5  ( x² - 4 x + 4 ) =  0.5 x² - 2 x + 2  

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