题目内容
设f(x)=
,且f(x)的图象过点(
,
),
(1)求f(x)表达式;
(2)计算f(x)+f(1-x);
(3)试求f(
)+f(
)+f(
)+…+f(
)+f(
)的值.
| 4x |
| 4x+a |
| 1 |
| 2 |
| 1 |
| 2 |
(1)求f(x)表达式;
(2)计算f(x)+f(1-x);
(3)试求f(
| 1 |
| 2007 |
| 2 |
| 2007 |
| 3 |
| 2007 |
| 2005 |
| 2007 |
| 2006 |
| 2007 |
(1)∵f(x)=
过点(
,
)
∴f(
)=
=
=
,解得a=2∴f(x)=
(2)f(x)+f(1-x)=
+
=
=
=1
(3)∵f(x)+f(1-x)=1
∴f(
)+f(
)=f(
)+f(
)=…=f(
)+f(
)=f(
)+f(
)=1
f(
)+f(
)+f(
)++f(
)+f(
)=1003
| 4x |
| 4x+a |
| 1 |
| 2 |
| 1 |
| 2 |
∴f(
| 1 |
| 2 |
4
| ||
4
|
| 2 |
| 2+a |
| 1 |
| 2 |
| 4x |
| 4x+2 |
(2)f(x)+f(1-x)=
| 4x |
| 4x+2 |
| 41-x |
| 41-x+2 |
| 4x(41-x+2)+41-x(4x+2) |
| (4x+2)(41-x+2) |
| 8+2•4x+2•41-x |
| 8+2•4x+2•41-x |
(3)∵f(x)+f(1-x)=1
∴f(
| 1 |
| 2007 |
| 2006 |
| 2007 |
| 2 |
| 2007 |
| 2005 |
| 2007 |
| 1002 |
| 2007 |
| 1005 |
| 2007 |
| 1003 |
| 2007 |
| 1004 |
| 2007 |
f(
| 1 |
| 2007 |
| 2 |
| 2007 |
| 3 |
| 2007 |
| 2005 |
| 2007 |
| 2006 |
| 2007 |
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