Réponses

2013-11-20T19:02:04+01:00
Bonsoir

Exercice I

A = 5/3 -4/3 x 7/11
A = 5/3 - 21/33
A = 55/33 - 21/33 = 34/33

B = (4/3 +3/10) : (5/2 -2/5)
B = (40/30 + 9/30) : (10/10 - 4/10)
B = 49/30 : 6/10
B = 49/30 x 10/6 = 49/18

C = -5 + (3/7 +4/5) x 1/3
C = -5 + ( 15/35 + 28/35) x 1/3
C = -5 + 43/35 x 1/3
C = -5 + 43/105
C = - 525/105 + 43/105
C = -482/105

D = 210 x 10^-6 x 5 x 10^5 sur 35 x 10^4
D = 1050 x 10^-1 sur 35 x 10^4
D = 30 x 10^-5
D = 3 x 10 x 10^-5 = 3 x 10^-4

Exercice II
(4x +5)(2x +3) = 8x² +12x +10x +15 = 8x² +22x +15
(4x +2)(3x+3) = 12x² +12x +6x +6 = 12x² +18x +6