Question

Tìm x,biết: a)x : \((\dfrac{3}{4})^{3} = (\dfrac{3}{4})^{2} \) b) \(\dfrac{2}{5}^{5} . x = \dfrac{2}{5}^{8}\)

Answer 1

a)(3/4)^2.(3/4)^3=x

(3/4)^5=x

x=243/1024

Answer 2

b)2/5^5.x=2/5^8

x=2/5^8:2/5^5

x=2/5^2

x=4/25

Answer 3

^-^

Answer 4

:)

Answer 5

a)

\(x:\left(\dfrac{3}{4}\right)^3=\left(\dfrac{3}{4}\right)^2\\ \Leftrightarrow x=\left(\dfrac{3}{4}\right)^2.\left(\dfrac{3}{4}\right)^3\\ \Leftrightarrow x=\left(\dfrac{3}{4}\right)^5\\ \Rightarrow x=\dfrac{243}{1024}\)

b)

\(\dfrac{2^5}{5}.x=\dfrac{2^8}{5}\\ \Leftrightarrow x=\dfrac{2^8}{5}.\dfrac{5}{2^5}\\ \Leftrightarrow x=2^3\\ \Rightarrow x=8\)