Question

tìm x biết: x:\((\dfrac{3}{4})^3=(\dfrac{3}{4})^2\)

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

Answer 1

a, Xem lại đề!

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

\(\Rightarrow x=\left(\dfrac{2}{5}\right)^8:\left(\dfrac{2}{5}\right)^5=\left(\dfrac{2}{5}\right)^3\)

\(\Rightarrow x=\dfrac{5}{125}\)

Chúc bạn học tốt!!!

Answer 2

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...

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

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

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