题目内容
已知函数f(x)满足:f(a+b)=f(a)•f(b),f(1)=2,则
+
+
+
=______.
| f2(1)+f(2) |
| f(1) |
| f2(2)+f(4) |
| f(3) |
| f2(3)+f(6) |
| f(5) |
| f2(4)+f(8) |
| f(7) |
运用条件知:
=f(1)=2,
且
+
+
+
=
+
+
+
=16
故答案为:16
| f(n+1) |
| f(n) |
且
| f2(1)+f(2) |
| f(1) |
| f2(2)+f(4) |
| f(3) |
| f2(3)+f(6) |
| f(5) |
| f2(4)+f(8) |
| f(7) |
=
| 2f(2) |
| f(1) |
| 2f(4) |
| f(3) |
| 2f(6) |
| f(5) |
| 2f(8) |
| f(7) |
故答案为:16
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