bonjour
B = ( 5 x- 2 ) ² + ( 5 x - 2 ) ( 3 x + 7 )
= 25 x² - 20 x + 4 + 15 x² + 35 x - 6 x - 14
= 40 x² + 9 x - 10
B = ( 5 x - 2 ) ( 5 x - 2 + 3 x + 7 )
= ( 5 x - 2 ) ( 8 x + 5 )
B = 0 pour x = 2/5 ou - 5/8
BD tintin = x
Bd Astérix = x + 1.5
11 x + 7 ( x + 1.5) = 127.50
11 x + 7 x + 10 5 = 127.5
18 x = 127.5 - 10.5
18 x = 117
x = 6.5
tintin = 6.5 € et astérix = 8 €
