Răspuns:
se inlocuieste a cu 3, 4,5,6,7,8,9
a) [tex]\frac{a-1}{a+1}[/tex]= [tex]\frac{3-1}{3+1}[/tex] = [tex]\frac{4-1}{4+1}[/tex]= [tex]\frac{5-1}{5+1} =\frac{6-1}{6+1 } = \frac{7-1}{7+1} =\frac{8 -1}{8+1 } = \frac{9-1}{9+1}[/tex]
[tex]\frac{a-1}{a+1}[/tex]= [tex]\frac{2}{4} = \frac{3}{5} = \frac{4}{6} =\frac{5}{7}[/tex] = [tex]\frac{6}{8}= \frac{7}{9} = \frac{8}{10}[/tex]
