若
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,则
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=
.
考点分析:
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有一张矩形纸片ABCD,AB=2.5,AD=1.5,将纸片折叠,使AD边落在AB边上,折痕为AE,再将△AED以DE为折痕向右折叠,AE与BC交于点F(如图),则CF的长为( )
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A.1
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B.1
C.
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D.
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正方形ABCD中,E、F分别为AB、BC的中点,AF与DE相交于点O,则
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=( )
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A.
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B.
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C.
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D.
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已知正方形ABCD,E是CD的中点,P是BC边上的一点,下列条件中不能推出△ABP与△ECP相似的是( )
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A.∠APB=∠EPC
B.∠APE=90°
C.P是BC的中点
D.BP:BC=2:3
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下列各式:①9x
2-y
2; ②2a
4-8a
3b+8a
2b
2; ③a
2+2ab-b
2; ④x
2-10xy
2+25y
4; ⑤7a
2-7; ⑥x
2-x+
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,
不能分解因式的有( )
A.1个
B.2个
C.3个
D.4个
查看答案