题目内容
先化简
-
,再把x=
代入求值.
9-6x+x2 |
x-3 |
| ||
x2-3x |
2 |
∵x=
,
∴x-3<0,
-
,
=
-
,
=x-3-
,
=x-3+
,
当x=
时,原式=x+
-3=
+
-3=
-3.
2 |
∴x-3<0,
9-6x+x2 |
x-3 |
| ||
x2-3x |
=
(x-3)2 |
x-3 |
| ||
x(x-3) |
=x-3-
3-x |
x(x-3) |
=x-3+
1 |
x |
当x=
2 |
1 |
x |
2 |
1 | ||
|
3
| ||
2 |
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