Bonjourr, j'ai un dm de maths à faire et je comprends rien du tout.. Ce sont les exos 62 et 30 ++ écrire avec une seule fraction: 1/x+1 + 2/3 et 3 - x/x+1. Merc

Bonsoir,

A = (2x + 3)/(x + 1) - 4(x + 1)/(x + 1)

A = (2x + 3 - 4x - 4)/(x + 1)

A = (-2x - 1)/(x + 1)

B = 5x(x - 2)/(x - 2) - 2/(x - 2)

B = (5x^2 - 10x - 2)/(x - 2)

C = 1/(x + 3) - 1/x

C = x/[x(x + 3)] - (x + 3)/[x(x + 3)]

C = (x - x - 3)/[x(x + 3)]

C = -3/[x(x + 3)]

D = x^2/(x - 1) - x

D = x^2/(x - 1) - x(x - 1)/(x - 1)

D = (x^2 - x^2 + x)/(x - 1)

D = x/(x - 1)

E = (x + 1)/(x + 4) + (x - 2)/((x - 3)

E = [(x + 1)(x - 3)]/[(x + 4)(x - 3)] + [(x - 2)(x + 4)]/[(x - 3)(x + 4) je te laisse finir le calcul :)

Exercice 30 :

Developper :

A = x^2 - (3 + x)^2

A = x^2 - 9 - 6x - x^2

A = 6x - 9

B = (a - 2)^2 - (a - 4)^2

B = a^2 - 4a + 4 - (a^2 - 8a + 16)

B = -4a + 8a + 4 - 16

B = 4a - 12

C = (2b + 1)^2 + (2 + b)^2

C = 4b^2 + 4b + 1 + 4 + 4b + b^2

C = 5b^2 + 8b + 5

[tex]D = (3 - 2U)(u - \sqrt2)[/tex]

[tex]D = 3U - 3\Sqrt2 - 2u^2 + 2u\sqrt2[/tex]

E = (x + 1)(x + 2)(x + 3)

A toi de jouer ;))