题目内容
(2013•温州二模)(1)计算:(π-
)0+2cos30°-|-
|
(2)化简:
-
.
2 |
3 |
(2)化简:
2x |
x2-1 |
1 |
x+1 |
分析:(1)利用零指数幂的性质以及特殊角的三角函数关系和绝对值的性质分别化简得出即可;
(2)首先将原式通分,进而化简得出即可.
(2)首先将原式通分,进而化简得出即可.
解答:解:(1)(π-
)0+2cos30°-|-
|
=1+
-
,
=1;
(2)原式=
-
=
-
=
=
=
.
2 |
3 |
=1+
3 |
3 |
=1;
(2)原式=
2x |
(x-1)(x+1) |
1 |
x-1 |
=
2x |
(x-1)(x+1) |
x+1 |
(x-1)(x+1) |
=
2x-x-1 |
(x-1)(x+1) |
=
x-1 |
(x-1)(x+1) |
=
1 |
x+1 |
点评:此题主要考查了实数的运算以及分式的加减运算,正确将分式进行通分再化简得出是解题关键.
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