Gaokao Math Practice Question
4. 下列函数中是增函数的为 $(\quad ）$
- A.$f(x)=-x$
- B.$f(x)=\left(\frac{2}{3}\right)^{x}$
- C.$f(x)=x^{2}$
- D.$f(x)=\sqrt[3]{x}$
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