Giá trị của 2^-3 là: A. (1)/(8) B. -8 C. 8 D. (1)/(3) Đáp án: A

The question asks for the value of \(2^{-3}\). In mathematics, an exponent refers to the number of times a number is multiplied by itself. For example, \(2^3\) means \(2 \times 2 \times 2\). When the exponent is negative, it means to take the reciprocal of the base raised to the positive version of that exponent. In this case, \(2^{-3}\) is equivalent to \(1/(2^3)\). \(2^3\) is \(2 \times 2 \times 2\), which equals 8. Therefore, \(2^{-3}\) is \(1/8\). This matches option A, which is \(\frac {1}{8}\).