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如图,将△ABC沿直线AB向右平移后到达△BDE的位置,若∠CAB=50°,∠A...
如图,将△ABC沿直线AB向右平移后到达△BDE的位置,若∠CAB=50°,∠ABC=100°,则∠CBE的度数为
.
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如图,六边形ABCDEF是正六边形,曲线FK
1K
2K
3K
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7…叫做“正六边形的渐开线”,其中
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,
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,…的圆心依次按点A,B,C,D,E,F循环,其弧长分别记为l
1,l
2,l
3,l
4,l
5,l
6,….当AB=1时,l
2011等于( )
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C.
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D.
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下列四个函数图象中,当x<0时,函数值y随自变量x的增大而减小的是( )
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D.
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正九边形的每个内角为( )
A.110°
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