问题 填空题
如果函数f(x)满足f(a+b)=f(a)•f(b)且f(1)=2则
f(2)
f(1)
+
f(3)
f(2)
+
f(4)
f(3)
+
f(6)
f(5)
+…+
f(2010)
f(2009)
+
f(2012)
f(2011)
=______.
答案

∵函数f(x)满足f(a+b)=f(a)•f(b)

∴f(n+1)=f(n)f(1)

∵f(1)=2

f(n+1)
f(n)
=f(1)=2

f(2)
f(1)
=f(1),
f(3)
f(2)
=f(1)
f(4)
f(3)
=f(1)
f(2012)
f(2011)
=f(1)

f(2)
f(1)
+
f(3)
f(2)
+
f(4)
f(3)
+
f(6)
f(5)
+…+
f(2010)
f(2009)
+
f(2012)
f(2011)
=2011f(1)=2011×2=4022

故答案为:4022

单项选择题
名词解释