[tex]a) \ (\sqrt{21})^{2} =(21^{\frac{1}{2}})^{2} = 21\\\\b) \ (\sqrt{1,7})^{2}=(1,7)^{\frac{1}{2}})^{2} = 1,7\\\\c) \ (\sqrt{0,125})^{2}=(0,125^{\frac{1}{2}})^{2} =0,125[/tex]
[tex]d) \ (\sqrt{\frac{2}{3}})^{2}=((\frac{2}{3})^{\frac{1}{2}})^{2} =\frac{2}{3}\\\\e) \ (\sqrt{5\frac{6}{7}})^{2}=((5\frac{6}{7})^{\frac{1}{2}})^{2} =5\frac{6}{7}\\\\f) \ (\sqrt{1\frac{1}{3000}}})^{2} = ((1\frac{1}{3000})^{\frac{1}{2}})^{2}= 1\frac{1}{3000}[/tex]
Wyjaśnienie
Z własności potęg:
[tex](a^{n})^{m} = a^{n\cdot m[/tex]
