Réponse :
1/ ( 4*10^-3) / ( 5*10^2 ) = 0.8 * 10^-3-2 = 0.8*10^-5 = 8*10^-6 REPONSE B
2/ 5x² +2x -3
avec x = -2
5*(-2)² +2*(-2) -3 = 5*4 +(-4) -3 = 20+(-7) = 13 REPONSE A
3/ il faut tester les 3 equations
A = x( x+1 ) 4 ( 4+1) = 4*5 = 20
B=(x+1 ) ( x-2 ) (4+1)( 4-2) = 5*2 = 10
C= (x+1) ² (4+1)² = 5² = 25
REPONSE B
4/ (3x + 5 ) ² = (3x)² +2*(3x *5 ) +5² = 9x² + 2*15x +25 = 9x² +30x + 25
REPONSE C
