a)
Vì 5^2 =25
=> \(\sqrt{25}=5\)
Vì 7^2=49
=>\(\sqrt{49}=7\)
Vì 1^2=1
=>\(\sqrt{1}=1\)
Vì \(\left(\frac{2}{3}\right)^2=\frac{4}{9}\)
=> \(\sqrt{\frac{4}{9}}=\frac{2}{3}\)
a) Vì \(5^2=25\Rightarrow\sqrt{25}=5\)
b) Vì \(7^2=49\Rightarrow\sqrt{49}=7\)
c) Vì \(1^2=1\Rightarrow\sqrt{1}=1\)
d) Vì \(\left(\frac{2}{3}\right)^2=\frac{4}{9}\Rightarrow\sqrt{\frac{4}{9}}=\frac{2}{3}\)
a)Vì 52=25 nên \(\sqrt{25}=5\)
b)Vì 72=49 nên \(\sqrt{49}=7\)
c)Vì 12=1 nên \(\sqrt{1}=1\)
d)Vì \(\left(\frac{2}{3}\right)^2=\frac{4}{9}\) nên \(\sqrt{\frac{4}{9}}=\frac{\sqrt{4}}{\sqrt{9}}=\frac{2}{3}\)