If X is positive, which of the following could be the correct ordering of 1/x,2x,and square x? I square x < 2x < 1/x II square x < 1/x< 2x III 2x < square x < 1/x a None b I only c III only d I and II only e I. II. and III 我选择了A,因为他只说了x 是正数,但没说 大于1还是小于一啊。 但答案是D 请各位NN指教!! |