题目内容

10.试比较下列各数的大小.
$(\frac{2}{3})^{-\frac{1}{3}}$,$(\frac{3}{5})^{\frac{1}{2}}$,${3}^{\frac{2}{3}}$,$(\frac{2}{5})^{\frac{1}{2}}$,$(\frac{3}{2})^{\frac{2}{3}}$,$(\frac{5}{6})^{0}$,$(\frac{5}{3})^{-\frac{2}{5}}$.

分析 根据指数函数幂函数的图象和性质即可判断.

解答 解:根据幂函数性质,可得$(\frac{2}{5})^{\frac{1}{2}}$<$(\frac{3}{5})^{\frac{1}{2}}$<1,${3}^{\frac{2}{3}}$>$(\frac{3}{2})^{\frac{2}{3}}$>1
∵($\frac{2}{3}$)${\;}^{-\frac{1}{3}}$=$(\frac{3}{2})^{\frac{1}{3}}$,
∴($\frac{2}{3}$)${\;}^{-\frac{1}{3}}$=$(\frac{3}{2})^{\frac{1}{3}}$<$(\frac{3}{2})^{\frac{2}{3}}$,
∵$(\frac{5}{3})^{-\frac{2}{5}}$=$(\frac{3}{5})^{\frac{2}{5}}$<1,
∴$(\frac{5}{3})^{-\frac{2}{5}}$=$(\frac{3}{5})^{\frac{2}{5}}$>$(\frac{3}{5})^{\frac{1}{2}}$,
∵$(\frac{5}{6})^{0}$=1,
∴$(\frac{2}{5})^{\frac{1}{2}}$<$(\frac{3}{5})^{\frac{1}{2}}$<$(\frac{5}{3})^{-\frac{2}{5}}$<$(\frac{5}{6})^{0}$<($\frac{2}{3}$)${\;}^{-\frac{1}{3}}$<$(\frac{3}{2})^{\frac{2}{3}}$<${3}^{\frac{2}{3}}$

点评 本题考查了指数函数幂函数的图象和性质,属于基础题.

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