(2001•宁波)计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019105435746808312/SYS201310191054357468083020_ST/0.png)
.
考点分析:
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(2001•宁波)如图:D,E分别是△ABC的边BC、AC上的点,若AB=AC,AD=AE,则( )
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A.当∠B为定值时,∠CDE为定值
B.当∠α为定值时,∠CDE为定值
C.当∠β为定值时,∠CDE为定值
D.当∠γ为定值时,∠CDE为定值
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(2001•宁波)如图,矩形纸片ABCD沿DF折叠后,点C落在AB上的E点.DE、DF三等分∠ADC,AB的长为6,则梯形ABFD的中位线长为( )
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A.不能确定
B.
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C.
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D.
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A.3.6π千米/小时
B.1.8π千米/小时
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(2001•宁波)已知点(-1,y
1)、(-3
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,y
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(2001•宁波)数a在数轴上表示如图,则化简
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A.-1
B.1-2a
C.1
D.2a-1
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