题目内容
(2010•巢湖模拟)计算:-22-![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_ST/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_ST/1.png)
【答案】分析:根据有理数的乘方的意义,负整数指数次幂等于正整数次幂的倒数,特殊角的三角函数,绝对值的性质解答.
解答:解:原式=-4-4+2×
+(
),
=-8+
+
-1,
=-9+2
.
点评:本题主要考查了实数的综合运算能力,是各地中考题中常见的计算题型.解决此题的关键是熟练掌握负整数指数幂、绝对值和特殊角的三角函数值的运算.
解答:解:原式=-4-4+2×
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_DA/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_DA/1.png)
=-8+
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_DA/2.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_DA/3.png)
=-9+2
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131021225725747672651/SYS201310212257257476726014_DA/4.png)
点评:本题主要考查了实数的综合运算能力,是各地中考题中常见的计算题型.解决此题的关键是熟练掌握负整数指数幂、绝对值和特殊角的三角函数值的运算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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