题目内容
化简:(1)
-3
+sin45°;(2)
+
.
| 1 | ||
|
| 2 |
| 3x |
| (x-3)2 |
| x |
| x-3 |
(1)原式=
-3
+
=-2
;
(2)原式=
+
=
=
.
| ||
| 2 |
| 2 |
| ||
| 2 |
=-2
| 2 |
(2)原式=
| 3x |
| (x-3)2 |
| x(x-3) |
| (x-3)2 |
=
| 3x+x2-3x |
| (x-3)2 |
=
| x2 |
| (x-3)2 |
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