函数y=
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+
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中自变量x的取值范围是
.
考点分析:
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在直角梯形ABCD中,AD∥BC,∠ABC=90°,AB=BC,E为AB边上一点,∠BCE=15°,且AE=AD.连接DE交对角线AC于H,连接BH.下列结论:
①△ACD≌△ACE;②△CDE为等边三角形;③
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=2;④
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.
其中结论正确的是( )
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A.只有①②
B.只有①②④
C.只有③④
D.①②③④
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某校用420元钱到商场去购买“84”消毒液,经过还价,每瓶便宜0.5元,结果比用原价多买了20瓶,求原价每瓶多少元?设原价每瓶x元,则可列出方程为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164741106323741/SYS201310221647411063237006_ST/0.png)
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=20
B.
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-
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=20
C.
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-
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=0.5
D.
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-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164741106323741/SYS201310221647411063237006_ST/7.png)
=0.5
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将直径为30cm的圆形铁皮,做成三个相同的圆锥容器的侧面(不浪费材料,不计接缝处的材料损耗),那么每个圆锥容器的底面半径为( )
A.5cm
B.15cm
C.20cm
D.150cm
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