

cho [tex]x+\frac{1}{x}=3[/tex] tính
a)[tex]A=x^{2}+\frac{1}{x^{2}}[/tex]
b)[tex]B=x^{3}+\frac{1}{x^{3}}[/tex]
c)[tex]C=x^{4}+\frac{1}{x^{4}}[/tex]
d)[tex]D=x^{5}+\frac{1}{x^{5}}[/tex]
a)[tex]A=x^{2}+\frac{1}{x^{2}}[/tex]
b)[tex]B=x^{3}+\frac{1}{x^{3}}[/tex]
c)[tex]C=x^{4}+\frac{1}{x^{4}}[/tex]
d)[tex]D=x^{5}+\frac{1}{x^{5}}[/tex]