Réponses

2013-06-05T20:39:54+02:00

Bonsoir

 

je suppose qu'il s'agit de l'exercice du bas.

Donc

 

D = 4/9 -2 x 13+3/13-3

D = 4/9 - 2 x 16/10

D = 4/9 -32/10

D = 40/90 - 288/90

d = 248/90

D = 124/45

 

E = 18 -16+4/7

E = 2+4/7

E = 14/7+4/7

E = 18/7

 

F = Barre du haut = -7/35-10/35 : 49/49 -15/49

F = -17/35 : 34/49

F = -17/35 x 49/34

F = -1/5 x 7/2

F = -7/10

2013-06-05T20:44:23+02:00
Exercice 4:
A=2x(x-2)+3(5-x)-15
A=2x^2-4x+15-3x-15
A=2x^2-7x

B=7x^2-(5-2x^2)+x(x+1)
B=7x^2-5+2x^2+x^2+x
B=10x^2+x-5

C=2x-(x^2+x+1)+2x(2-x)
C=2x-x^2-x-1+4x-2x^2
C=-3x^2+5x-1

Exercice 5:
D=(4/9)-2((13+3)/(13-3))
D=(4/9)-2*(16/10)
D=(4/9)-(2*16)/(2*5)
D=(4/9)-(16/5)
D=(20/45)-(144/45)
D=-124/45

E=18-16:(4/7)
E=18-16*7/4
E=18-4*4*7/4
E=18-28=-10

F=((-1/5)-(2/7))/(1-(15/49)
F=((-7/35)-(10/35))/((49/49)-(15/49))
F=(-17/35)/(34/49)
F=-(17/35)*(49/34)
F=-(17/35)/(49/2*17)
F=-49/70