26.已知:如图所示.关于的抛物线与轴交于点.点.与轴交于点. (1)求出此抛物线的解析式.并写出顶点坐标, (2)在抛物线上有一点.使四边形为等腰梯形.写出点的坐标.并求出直线的解析式, 中的直线交抛物线的对称轴于点.抛物线上有一动点.轴上有一动点.是否存在以为顶点的平行四边形?如果存在.请直接写出点的坐标,如果不存在.请说明理由. (2009年辽宁抚顺26题解析)26.解:(1)根据题意.得 ·········································· 1分 解得··············································· 3分 抛物线的解析式为········· 4分 顶点坐标是(2.4)······································································································ 5分 (2)················································································································ 6分 设直线的解析式为 直线经过点点 ············································································································· 7分 ······················································································································ 8分 ················································································································ 9分 (3)存在.················································································································ 10分 ············································································································ 11分 ······································································································· 12分 ············································································································ 13分 ············································································································ 14分 查看更多

 

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五月花海,歌声飘扬,2009年5月,义乌市各中小学举行了“班班有歌声”活动,某校比赛聘请了10位老师和10位学生担任评委,其中甲班的得分情况如下统计图(表)所示.
(1)在频数分布直方图中,自左向右第四组的频数为
 

(2)学生评委计分的中位数是
 
分;
(3)计分办法规定:老师、学生评委的计分各去掉一个最高分、一个最低分,分别计算平均分,别且按老师、学生各占60%、40%的方法计算各班最后得分.已知甲班最后得分为94.4分,求统计表中x的值.
老师评分统计表格:
评委序号 1 2 3 4 5 6 7 8 9 10
分数 94 96 93 91 x 92 91 98 96 93
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某工厂用A、B、C三台机器加工生产一种产品.对2009年第一季度的生产情况进行统计,图1是三台机器的产量统计图,图2是三台机器产量的比例分布图.
(图中有部分信息未给出)
(1)利用图1信息,写出B机器的产量,并估计A机器的产量;
(2)综合图1和图2信息,求C机器的产量.
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10、针对近期关于3G牌照的消息,中金公司日前预计,国内三大运营商2009年~2010年3G网络建设总投资将达到2 800亿元,请将2 800亿用科学记数法表示
2.8×1011

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1、2009年入秋以来,我国西南地区遭遇历史罕见的特大旱灾,到目前为止,已致广西、云南、重庆、四川、贵州等五省(自治区、直辖市)5000多万人受灾,饮水困难人口约为1609万人,1609万人用科学记数法表示为(  )人.

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9、为了美化环境,某市加大对绿化的投资.2007年用于绿化投资20万元,2009年用于绿化投资25万元,求这两年绿化投资的年平均增长率.设这两年绿化投资的年平均增长率为x,根据题意所列方程为(  )

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