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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

A.2                B.2                C.-2               D.-2

A.(0,)                                     B.(0, ］

C.( ,+∞)                                D.(0,+∞)

A.R                                            B.［8,+∞)

C.(-∞,-3］                                 D.［-3,+∞)

A.A={1,2,4,8,16}

B.A={0,1,2,log23}

C.A{0,1,2,log23}

D.不存在滿足條件的集合

(1)證明函數(shù)f(x)在(-1,+∞)上為增函數(shù);

(2)用反證法證明方程f(x)=0沒有負(fù)數(shù)根.

(2)化簡:.