Răspuns:
a) [tex]\frac{2}{3}[/tex]
b) [tex]\frac{16}{3}[/tex]
c) [tex]\frac{5}{3}[/tex]
Explicație pas cu pas:
a) [tex]\sqrt{0,(4)}[/tex] = [tex]\sqrt{\frac{4}{9}}[/tex] = [tex]\frac{\sqrt{4}}{\sqrt{9}}[/tex] = [tex]\frac{2}{3}[/tex]
b) [tex]\sqrt{28,(4)}[/tex] = [tex]\sqrt{28\frac{4}{9}}[/tex] = [tex]\sqrt{\frac{256}{9}}[/tex] = [tex]\frac{16}{3}[/tex]
c) [tex]\sqrt{2,(7)}[/tex] = [tex]\sqrt{2\frac{7}{9}}[/tex] = [tex]\sqrt{\frac{25}{9}}[/tex] = [tex]\frac{5}{3}[/tex]
