bonjour
A = ( 2 x + 3 ) ( 4 x + 4 ) - ( 4 x - 2 ) ( x + 6 )
A = 8 x² + 8 x + 12 x + 12 - ( 4 x² + 24 x - 2 x - 12 )
A = 8 x² + 20 x + 12 - 4 x² - 24 x + 2 x + 12
A = 4 x² - 2 x + 24
si x = 100
A = 4 *100² - 2 *100 + 24
A = 40 000 - 200 + 24
A = 39 824 m