如圖,在所標(biāo)識的角中,互為對頂角是( )
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互為對頂角的兩個角的兩條邊互為反向延長線,
觀察圖中的角,
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和
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是對頂角,故選C
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中,
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,
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,
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,點
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、
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、
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、
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在一條直線上。當(dāng)點
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和點
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重合時,等腰
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靜止不動,等腰
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從
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出發(fā),沿線段
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方向以每秒1個單位長度的速度勻速運動,當(dāng)
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點與
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點重合時,停止運動。設(shè)運動時間為
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秒
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。
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小題1:請?zhí)羁眨寒?dāng)
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、12、14秒時,
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的長度分別為
、
、
;
小題2:在等腰
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的運動過程中,設(shè)等腰
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和等腰
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重疊部分的面積為
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,請直接寫出
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與
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的函數(shù)關(guān)系式和相應(yīng)的自變量
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的取值范圍;
小題3:如圖2,當(dāng)
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點與
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點重合時,將等腰
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繞點
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順時針轉(zhuǎn)
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角(
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),連接
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、
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,過點
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作
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,延長
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。
①求證:
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;
②若
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,求
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的長度。
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