Réponses

2014-03-19T20:56:01+01:00
Bonjour
A = 1/(2a(2a-1)) - 2a/(2a-1) + (2a-1)/ 2a
A = 1/(2a(2a-1)) - 4a²/(2a(2a-1)) + (2a-1)²/(2a(2a-1))
A = (1-4a²+4a²+1-4a)/(4a²-2a)
A = (2-4a)/(4a²-2a)

B = 1/(a+1) - (1-1/a)/(1+1/a)
B = 1/(a+1) - (a-1)/(a+1)/a
B = 1/(a+1)-((a-1)/a)(a/(a+1))
B = 1/(a+1)-(a-1)/(a+1)
B = (1-a+1)/(a+1)
B = (2-a)/a+1)