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在阳光下,一名同学测得一根长为1米的竹竿的影长为0.8米,同时另一名同学测得一棵...
在阳光下,一名同学测得一根长为1米的竹竿的影长为0.8米,同时另一名同学测得一棵树落在学校墙壁上的影长为1.2米,此树落在地面上的影长为2.4米,则此树的高为 米.
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如图,AB是⊙O的直径,弦CD⊥AB,垂足是G,F是CG的中点,延长AF交⊙O于E,CF=2,AF=3,则EF的长是
.
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若x
2-3x+1=0,则
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的值为
.
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如图,六边形ABCDEF是正六边形,曲线FK
1K
2K
3K
4K
5K
6K
7…叫做“正六边形的渐开线”,其中
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,
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,
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,
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,
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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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A.
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B.
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C.
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D.
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