Question

Tìm x, biết:

a) x : \(\left(\dfrac{3}{4}\right)^3\)= \(\left(\dfrac{3}{4}\right)^2\) b) \(\left(\dfrac{2}{5}\right)^5\). x = \(\left(\dfrac{2}{5}\right)^8\)

Answer 1

b)\(\left(\dfrac{2}{5}\right)^5.x=\left(\dfrac{2}{5}\right)^8\)

\(x=\left(\dfrac{2}{5}\right)^8:\left(\dfrac{2}{5}\right)^5\)

\(x=\dfrac{8}{125}\)

Answer 2

a/ \(x:\left(\dfrac{3}{4}\right)^3=\left(\dfrac{3}{4}\right)^2\)

\(\Leftrightarrow x=\left(\dfrac{3}{4}\right)^2.\left(\dfrac{3}{4}\right)^3\)

\(\Leftrightarrow x=\left(\dfrac{3}{4}\right)^5\)

Vậy ...

b/ \(\left(\dfrac{2}{5}\right)^5.x=\left(\dfrac{2}{5}\right)^8\)

\(\Leftrightarrow x=\left(\dfrac{2}{5}\right)^8:\left(\dfrac{2}{5}\right)^5\)

\(\Leftrightarrow x=\left(\dfrac{2}{5}\right)^3\)

Vậy ..

Answer 3

a) x : \(\left(\dfrac{3}{4}\right)^3=\left(\dfrac{3}{4}\right)^2\)

x = \(\left(\dfrac{3}{4}\right)^2.\left(\dfrac{3}{4}\right)^3\)

x =\(\left(\dfrac{3}{4}\right)^5\)

Vậy x =\(\left(\dfrac{3}{4}\right)^5\)

b) \(\left(\dfrac{2}{5}\right)^5.x=\left(\dfrac{2}{5}\right)^8\)

\(x=\left(\dfrac{2}{5}\right)^8:\left(\dfrac{2}{5}\right)^5\)

\(x=\left(\dfrac{2}{5}\right)^3\)

Vậy \(x=\left(\dfrac{2}{5}\right)^3\)

Answer 4

a) \(x:\left(\dfrac{3}{4}\right)^2=\left(\dfrac{3}{4}\right)^2\)

\(x=\left(\dfrac{3}{4}\right)^2.\left(\dfrac{3}{4}\right)^2\)

\(x=\dfrac{81}{256}\)

Answer 5

(2/5)tất cả mũ 3