Bonjours à rendre vendredi merci d'avance je n'y arrive pas du tout

Bonjour,

V = 1/(x + 1) + 2/(x - 1)
V = (x - 1)/[(x + 1)(x - 1)] + [2(x + 1)]/[(x + 1)(x - 1)]
V = [x - 1 + 2x + 2]/[x^2 - 1]
V = (3x + 1)/(x^2 - 1)

I = 5/(2x - 1) + 1
I = 5/(2x - 1) + (2x - 1)/(2x - 1)
I = (5 + 2x - 1)/(2x - 1)
I = (4 + 2x)/(2x - 1)

T = 4/x + (x - 1)/(3x + 5)
T = [4(3x + 5)]/[x(3x + 5)] + [x(x - 1)]/[x(3x + 5)]
T = (12x + 20 + x^2 - x)/(3x^2 + 5x)
T = (x^2 + 11x + 20)/(3x^2 + 5x)

E = x/(1 - 5x) + 2/(x + 1)
E = [x(x + 1)]/[(1 - 5x)(x + 1)] + [2(1 - 5x)]/[(1 - 5x)(x + 1)]
E = (x^2 + x + 2 - 10x)/[(1 - 5x)(x + 1)]
E = (x^2 - 9x + 2)/([(1 - 5x)(x + 1)]