问题 填空题
已知函数f(x)满足:f(p+q)=f(p)f(q),f(1)=2,则:
f(2)
f(1)
+
f(4)
f(3)
+
f(6)
f(5)
+
f(8)
f(7)
+…+
f(2006)
f(2005)
=______
答案

∵f(p+q)=f(p)f(q),

∴f(p+1)=f(p)f(1)即

f(p+1)
f(p)
=f(1)=2,

f(2)
f(1)
=2,
f(4)
f(3)
=2
f(2006)
f(2005)
=2

f(2)
f(1)
+
f(4)
f(3)
+
f(6)
f(5)
+
f(8)
f(7)
+…+
f(2006)
f(2005)
=2×1003=2006

故答案为:2006

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