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如图为我市5月某一周每天的最高气温统计,则这组数据(最高气温)的众数与中位数分别...
如图为我市5月某一周每天的最高气温统计,则这组数据(最高气温)的众数与中位数分别是
.
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如图,在直角梯形ABCD中,AD∥BC,∠ADC=90°,BC=CD,E为梯形内一点,∠BEC=90°,将△BEC绕C点旋转90°,使BC与DC重合,得到△DCF,连接EF交CD于点M.给出以下5个命题:
①DM:MC=MF:ME;
②BE⊥DF;
③若sin
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,则
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;
④若tan
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,则点D到直线CE的距离为1;
⑤若M为EF中点,则点B、E、D三点在同一直线上.
则正确命题的个数( )
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A.2
B.3
C.4
D.5
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如图,菱形ABCD中,∠A=60°,AB=2,动点P从点B出发,以每秒1个单位长度的速度沿B→C→D向终点D运动.同时动点Q从点A出发,以相同的速度沿A→D→B向终点B运动,运动的时间为x秒,当点P到达点D时,点P、Q同时停止运动,设△APQ的面积为y,则反映y与x的函数关系的图象是( )
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D.
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D.
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2-1
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A.(1)(2)
B.(1)(3)
C.(1)(4)
D.(2)(3)
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