题目内容
(1)计算:-22+(
)0+2sin30°
(2)先化简,再求值:
+
÷x,其中x=2.
| 1 | ||
|
(2)先化简,再求值:
| x2-1 |
| x2-2x+1 |
| x2-2x |
| x-2 |
(1)-22+(
)0+2sin30°
=-4+1+2×
=-4+1+1
=-2;
(2)
+
÷x
=
+1
=
.
| 1 | ||
|
=-4+1+2×
| 1 |
| 2 |
=-4+1+1
=-2;
(2)
| x2-1 |
| x2-2x+1 |
| x2-2x |
| x-2 |
=
| x+1 |
| x-1 |
=
| 2x |
| x-1 |
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