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    26．如图.已知直线与直线相交于点分别交轴于两点．矩形的顶点分别在直线上.顶点都在轴上.且点与点重合． (1)求的面积, (2)求矩形的边与的长, (3)若矩形从原点出发.沿轴的反方向以每秒1个单位长度的速度平移.设移动时间为秒.矩形与重叠部分的面积为.求关于的函数关系式.并写出相应的的取值范围． (1)解:由得点坐标为 由得点坐标为 ∴··················································································· 由解得∴点的坐标为···································· ∴··························································· (2)解:∵点在上且 ∴点坐标为······················································································ 又∵点在上且 ∴点坐标为······················································································ ∴··········································································· (3)解法一:当时.如图1.矩形与重叠部分为五边形(时.为四边形)．过作于.则 ∴即∴ ∴ 即··································································· 【查看更多】

     

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    （2009•山西）山西有着丰富的旅游资源，如五台山、平遥古城、乔家大院等著名景点，吸引了众多的海内外游客，2008年全省旅游总收入739.3亿元，这个数据用科学记数法可表示为    元．

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    （2009•山西）山西有着丰富的旅游资源，如五台山、平遥古城、乔家大院等著名景点，吸引了众多的海内外游客，2008年全省旅游总收入739.3亿元，这个数据用科学记数法可表示为    元．

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