Question

Answer 1

Câu 2.

\(a)\)\(\left(\dfrac{1}{5}\right)\cdot\left(\dfrac{1}{5}\right)^{15}=\left(\dfrac{1}{5}\right)^{1+15}=\left(\dfrac{1}{5}\right)^{16}\)

\(b)\)\(\left(-10,2\right)^{10}:\left(-10,2\right)^3=\left(-10,2\right)^{10-3}=\left(-10,2\right)^7\)

\(c)\) \(\left[\left(-\dfrac{7}{9}\right)^7\right]^8=\left(-\dfrac{7}{9}\right)^{7\cdot8}=\left(-\dfrac{7}{9}\right)^{56}\)

Câu 3.

\(a)\)\(\sqrt{20}=4,47213595...\approx4,47\)

\(b)\)\(-\sqrt{134}=-11,57583...\approx-11,58\)

\(c)\) \(\sqrt{2021}=44,9555335...\approx44,96\)

#Ayumu

Answer 2

3:

a: \(\sqrt{20}\simeq4,47\)

b: \(-\sqrt{134}\) không phải căn bậc hai số học nha bạn

c: \(\sqrt{2021}\simeq44,96\)