题目内容
先化简下面的式子，再自取一个适当的x的值代入求值
÷(x-
)+(sin45°-
)0-(
)-1．
| 3x2-3 |
| x2-2x+1 |
| 2 |
| x-1 |
| 1 |
| 2 |
| 1 |
| 2 |
原式=
÷
+1-2
=
•
-1
=
-1
=
，
当x=5时，原式=
=0．
| 3(x+1)(x-1) |
| (x-1)2 |
| (x-2)(x+1) |
| x-1 |
=
| 3(x+1) |
| x-1 |
| x-1 |
| (x-2)(x+1) |
=
| 3 |
| x-2 |
=
| 5-x |
| x-2 |
当x=5时，原式=
| 5-5 |
| 5-2 |
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