Question

Mentionati conditiile de existenta si aduceti fractiile la acelasi numitor:
a) 7$\frac{7}{x}$ si $\frac{12}{a}$
b) $\frac{2}{x+1}$ si $\frac{3}{x-1}$
va rog sa scrieti rezolvarile complet 

Answer 1

a) x si a≠0

$\frac{7x+7}{x}$=$\frac{7ax+7a}{xa}$

$\frac{12}{a}$=$\frac{12x}{ax}$

b)x+1≠0=>x≠-1
x-1≠0=>x≠1

$\frac{12}{x+1}$=$\frac{12(x-1)}{x^2-1}$

$\frac{3}{x-1}$=$\frac{3(x+1)}{x^2-1}$