已知函數(shù)f(x)滿足：對(duì)任意實(shí)數(shù)x₁、x₂,當(dāng)x₁＜x₂時(shí)，有f(x₁)＜f(x₂),且f(x₁+x₂)=f(x₁)·f(x₂).寫出一個(gè)滿足上述條件的函數(shù)___________.

已知函數(shù)f(x)滿足：f(p+q)=f(p)f(q),f(1)=3，

則= __________.

已知函數(shù)f(x)滿足：對(duì)任意實(shí)數(shù)x₁,x₂,當(dāng)x₁＜x₂時(shí)，有f(x₁)＞f(x₂),且f(x₁+x₂)=f(x₁)f(x₂),則f(x)=_____________(請(qǐng)寫出一個(gè)滿足這些條件的函數(shù)即可).

已知函數(shù)f(x)滿足：當(dāng)x≥4時(shí)，f(x)＝()^x；當(dāng)x＜4時(shí)，f(x)＝f(x＋1)，則f(2＋log₂3)＝(　　)

A.               B.

C.                D.

已知函數(shù)f(x)滿足：當(dāng)x≥4時(shí)，f(x)＝^x；當(dāng)x<4時(shí)，f(x)＝f(x＋1)．則f(2＋log₂3)＝

A．             B．              C．               D．