Tìm n biết:

a) \(\dfrac{32}{\left(-2\right)^n}=4\)

b) \(\dfrac{8}{2^n}\)\(=2\)

c) \(\left(\dfrac{1}{2}\right)^{2n-1}\)\(=\dfrac{1}{8}\)

Tính:

a) \(\dfrac{5^4.20^4}{25^3.4^5}\)

b) \(\left(\dfrac{-10}{3}\right)^5\) .\(\left(\dfrac{-6}{5}\right)^4\)

tính:

a) (\(\dfrac{3}{7}\)+\(\dfrac{1}{2}\))\(^2\)

Tìm y là số nguyên :

\(y\dfrac{5}{y}=\dfrac{86}{y}\) (\(y\dfrac{5}{y}\) là hỗn số)

Tìm x là số nguyên 

\(\dfrac{x+46}{20}=x\dfrac{2}{5}\)(\(x\dfrac{2}{5}\)là hỗn số)

Tìm x ϵ Z biết: 

\(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)

\(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)

Tìm các số nguyên x,y biết:

a)\(\dfrac{6}{2x+1}=\dfrac{2}{7}\)

b) \(\dfrac{24}{7x-3}=\dfrac{-4}{25}\)

c) \(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)

d) \(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)

e) \(\dfrac{x+46}{20}=x\dfrac{2}{5}\)

f) \(y\dfrac{5}{y}=\dfrac{86}{y}\) ( \(x\dfrac{2}{5};y\dfrac{5}{y}\) là các hỗn số)

Tìm x biết:

(\(1\dfrac{1}{3}\)\(-25\%\)\(-\dfrac{5}{12}\))+2x=\(1,6:\dfrac{3}{5}\)

Tìm x biết:

(50%.x+5\(\dfrac{1}{4}\)).\(\dfrac{-2}{3}\)=2\(\dfrac{5}{6}\)