Question

\(\left[\left(-2,7\right)^4\right]^5-\left[\left(-2,7\right)^2\right]^{10}\)

Answer 1

\(\left[\left(-2,7\right)^4\right]^5-\left[\left(-2,7\right)^2\right]^{10}\)

\(=\left[\left(-2,7\right)^4\right]^5-\left[\left(-2,7\right)^2\right]^{2.5}\)

\(=\left[\left(-2,7\right)^4\right]^5-\left[\left(-2,7\right)^4\right]^5=0\)

Vậy..............

Answer 2

\(\left[\left(-2,7\right)^4\right]^5-\left[\left(-2,7\right)^2\right]^{10}=\left[\left(-2,7\right)^2\right]^{2.5}-\left[\left(-2,7\right)^2\right]^{10}=\left[\left(-2,7\right)^2\right]^{10}-\left[\left(-2,7\right)^2\right]^{10}=0\)