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Sagot :

Bonsoir
1)
Aire ABCD = (2x+1)² 
Aire ABEF = (2x+1)(x+3) 

Aire FECD = Aire ABCD - Aire ABEF 
Aire FECD = (2x+1)²-(2x+1)(x+3) 
Aire FECD = (2x+1)(2x+1-x-3) = (2x+1)(x-2) 
2)
FD = (2x+1) - (x+3) = x-2 

Aire FECD = (2x+1)(x-2) 

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