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( 13 + 4 )² - 13² + 3 x 13

formule  =  

( x + 4 ) ² - x² +  3 x

= x² + 8 x + 16 - x² + 3 x

= 11 x + 16

( 13 + 4 )² - 13² + 3 x 13

=  11 x13 + 16 =  159

( 8 + 4 )² - 8 ² + 8 x 3

= 11 x 8 + 16 =  88 + 16 =  104

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