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(2001•黑龙江)已知三角形的两边长分别为5和7,则第三边上的中线长x的取值范...
(2001•黑龙江)已知三角形的两边长分别为5和7,则第三边上的中线长x的取值范围是 .
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(2001•四川)如图,在Rt△ABC中,∠C=90度,已知
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B.
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C.
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D.
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(2001•绍兴)如图,△ABC中,∠C=90°,AC=8cm,AB=10cm,点P由点C出发以每秒2 cm的速度沿线CA向点A运动(不运动至A点),⊙O的圆心在BP上,且⊙O分别与AB、AC相切,当点P运动2秒钟时,⊙O的半径是( )
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A.
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cm
B.
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cm
C.
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cm
D.2cm
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(2001•杭州)如图,在正三角形ABC中,D,E分别在AC,AB上,且
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A.△AED∽△BED
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D.△BAD∽△BCD
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