题目内容
若f(x+y)=f(x)•f(y),且f(1)=1,则
+
+…+
+
=______.
| f(2) |
| f(1) |
| f(4) |
| f(3) |
| f(2010) |
| f(2009) |
| f(2012) |
| f(2011) |
∵f(x+y)=f(x)•f(y),f(1)=1,
令y=1,则f(x+1)=f(x)•f(1),
∴
=f(1)=1,
∴
+
+…+
+
=1006
故答案为:1006
令y=1,则f(x+1)=f(x)•f(1),
∴
| f(x+1) |
| f(x) |
∴
| f(2) |
| f(1) |
| f(4) |
| f(3) |
| f(2010) |
| f(2009) |
| f(2012) |
| f(2011) |
故答案为:1006
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