Répondre :
bonjour
1 ) aire AMGF = x²
2) MB = 8 - x
3 ) HE = 5 - x
4 ) aire GHED = ( 8 - x ) ( 5 - x )
5 ) x² = ( 8 - x ) ( 5 - x )
x² = 40 - 8 x - 5 x + x²
x² - x² + 8 x + 5 x = 40
13 x = 40
x = 40/13
bonne soirée
bonjour
1 ) aire AMGF = x²
2) MB = 8 - x
3 ) HE = 5 - x
4 ) aire GHED = ( 8 - x ) ( 5 - x )
5 ) x² = ( 8 - x ) ( 5 - x )
x² = 40 - 8 x - 5 x + x²
x² - x² + 8 x + 5 x = 40
13 x = 40
x = 40/13
bonne soirée