Question

已知,则(    )

A.2^b>2^a>2^c                                   B.2^a>2^b>2^c

C.2^c>2^b>2^a                                   D.2^c>2^a>2^b

Answer 1

A

解析:

由,

∴b>a>c.

又y=2^x为增函数,∴2^b>2^a>2^c.