如图,△ABC中,AC=CB,P是BC上一点,PD∥AB,PD=AD,PE⊥AC于E,PF⊥BC于F.求证:DE=BF.
考点分析:
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①化简求值:
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,其中,
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.
②解方程:
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+
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=1.
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函数y=
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和y=
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在第一象限内的图象如图,点P是y=
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的图象上一动点,PC⊥x轴于点C,交y=
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的图象于点B.给出如下结论:①△ODB与△OCA的面积相等;②PA与PB始终相等;③四边形PAOB的面积大小不会发生变化;④CA=
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AP.其中所有正确结论的序号是
.
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如图,在△ABC中,D、E分别是AB、AC上的点,DE∥BC,且AD=
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AB,则△ADE的周长与△ABC的周长的比为
.
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某地在一周内每天的最高气温(℃)分别是:24,20,22,23,25,23,21,则这组数据的极差是
℃.
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