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Sagot :

VINS

bonjour

N  = ( 2 x + 1 )² - ( 2 x - 1 )²

=  ( 2 x + 1 + 2 x - 1 ) ( 2 x + 1 - 2 x + 1 )

=  4 x ( 2 )

= 8 x

2 001² - 1 999²

=  ( 2 000 + 1 )² - (  2 000 - 1 )²

=   ( 2000 + 1 + 2000 - 1 ) ( 2000 + 1 - 2 000 + 1 )

=   4000 *  2

=  8000

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