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若2弧度的圆心角所对的弧长为4cm,则这个圆心角所夹的扇形的面积是 .
若2弧度的圆心角所对的弧长为4cm,则这个圆心角所夹的扇形的面积是 .
考点分析:
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化简以下各式:
①
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+
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+
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;②
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-
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+
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-
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;③
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-
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+
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;④
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+
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+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225849043441554/SYS201311012258490434415002_ST/12.png)
-
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.其结果为
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的个数是
.
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角α的终边落在y=-x(x>0)上,则sinα的值等于
.
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某城市1995年底人口总数为500万,人均住房面积为6平方米,如果该市每年人口的平均增长率为1%.而每年平均新建住房面积为30万平方米.那么到2005年年底,该市的人均住房面积数约为多少?(精确到0.01平方米)
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已知等比数列{a
n}的前四项为
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.
(1)求a
12+a
22+a
32+…+a
102的值;
(2)设b
n=a
n(a
n+1),S
n=b
1+b
2+…+b
n,求S
n.
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