Question

Giá trị của biểu thức sau a (1/2)^3 × (1/2)^2 b (-2/3)^7 : (-2/3)^5 c [(2/5)]^0

Answer 1

a)

\(\left(\dfrac{1}{2}\right)^3\times\left(\dfrac{1}{2}\right)^2\)

\(=\left(\dfrac{1}{2}\right)^{3+2}\)

\(=\left(\dfrac{1}{2}\right)^5\)

\(=\dfrac{1}{32}\)

b)

\(\left(-\dfrac{2}{3}\right)^7:\left(-\dfrac{2}{3}\right)^5\)

\(=\left(-\dfrac{2}{3}\right)^{7-5}\)

\(=\left(-\dfrac{2}{3}\right)^2\)

\(=\dfrac{4}{9}\)

c)

\(\left[\left(\dfrac{2}{5}\right)\right]^0=1\)