Réponses

2013-10-10T17:39:33+02:00
A= (2X+3)x(6X-1)
pour x=3.5
(2*3.5+3)*(6*3.5-1)
=(7+3)*(19.5-1)
=10*18.5
=185

pour x=2.25
(2*2.25+3)*(6*2.25-1)
=(4.5+3)*(13.5-1)
=7.5*12.5
=93.75
2013-10-10T17:39:43+02:00
A = (2 x 3,5 + 3) x (6 x 3,5 - 1)
A =  (7 + 3) x (21 - 1)
A = 10 x 20 
A = 200

B = (6 x 2,25 + 3) x (6 x 2,25 - 1)
B = (13,5 + 3) x (13,5 - 1)
B = 16,5 x 12,5
B = 206,25