Réponses

2012-12-16T21:49:09+01:00

Aire de TRI =( b*h)2 = (2x+1)(2x) = (4x²+2x)/2 = 2x²+x

 

Aire du rectangle = L*l

= (2x+1)(3x+2) = 6x²+4x+3x+2 = 6x² +7x +2

 

Aire des 2 = 6x²+7x+2+2x²+x = 8x²+8x+2

2012-12-16T21:51:24+01:00

Bonsoir

a) aire triangle  = [(2x+1)(2x)] /2 = (4x²+2x)/2 = 2x² +x

b) aire rectangle = (2x+1)(3x+2)=6x²+4x+3x+2 = 6x²+7x+2

c) Aire totale = 6x²+7x+2+2x²+x =8x²+8x+2