Respuesta :

ghanami
hello : 
[tex] \frac{5}{a} - \frac{2}{1-a} = \frac{2}{a-1} = \frac{5}{a}+ \frac{2}{a-1} = \frac{2}{a-1} = \frac{5(a-1)+2a}{a(a-1)} = \frac{2a}{a(a-1)} (a \neq 1 , a \neq 0) [/tex]
5a-5 +2a =2a
5a =5
a=1 ( refused)
conclusion : none