Tìm x, biết x:( - 1/2)^5 = ( - 1/2)^3

11/15

Tìm x, biết \(x:{\left( { - \frac{1}{2}} \right)^5} = {\left( { - \frac{1}{2}} \right)^3}\)

\(x = \frac{1}{{256}}\);

\(x = \frac{1}{{16}}\);

\(x = - \frac{1}{{256}}\);

\(x = - \frac{1}{{16}}\).

Giải thích

Đáp án đúng là: A

\(x:{\left( { - \frac{1}{2}} \right)^5} = {\left( { - \frac{1}{2}} \right)^3}\)

\(x = {\left( { - \frac{1}{2}} \right)^3} \cdot {\left( { - \frac{1}{2}} \right)^5}\)

\(x = {\left( { - \frac{1}{2}} \right)^{5 + 3}}\)

\(x = {\left( { - \frac{1}{2}} \right)^8} = \frac{1}{{256}}\). Vậy \(x = \frac{1}{{256}}\)