Ta có: \(\left(-2\right)^2\cdot10^2=\left(-2\right)^4\cdot5^2\left(=400\right)\)
=>\(\dfrac{\left(-2\right)^2}{\left(-2\right)^4}=\dfrac{5^2}{10^2};\dfrac{\left(-2\right)^2}{5^2}=\dfrac{\left(-2\right)^4}{10^2};\dfrac{\left(-2\right)^4}{\left(-2\right)^2}=\dfrac{10^2}{5^2};\dfrac{5^2}{\left(-2\right)^2}=\dfrac{10^2}{\left(-2\right)^4}\)
