With the fresh water ____ short, we human beings are facing the danger of dying from thirst at any t

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• 将x=23代入反比例函数y=-1x中，所得函数记为y1，又将x=y1+1代入函数中，所得函数记为y2，再持x=y2+1代入函数中，所得函数记为y3，如此继续下去，则y2009值为（）A．2B．-13C
• 如图，在平面直角坐标系中，矩形OEFG的顶点F的坐标为（4，2），将矩形OEFG绕点O逆时针旋转，使点F落在y轴上，得到矩形OMNP，OM与GF相交于点A．若经过点A的反比例函数(x＞0)的图象-九年
• 如图，矩形OABC放置在第一象限内，已知A(3，0)，∠AOB＝30°，反比例函数y＝的图像交BC、AB于点D、E．(1)若点D为BC的中点，试证明点E为AB的中点；(2)若点A关于直线OB的对称点为
• 如图，点A在反比例函数y＝(x>0)的图像上，点B在反比例函数y＝－(x<0)的图像上，且∠AOB＝90°，则tan∠OAB（）．A．B．C．D．-九年级数学
• 已知点(－1，y1)、(2，y2)、(3，y3)在反比例函数的图象上．下列结论中正确的是A．y1>y2>y3B．y1>y3>y2C．y3>y1>y2D．y2>
• 反比例函数y1=，y2=（k≠0）在第一象限的图象如图，过y1上的任意一点A，作x轴的平行线交y2于点B，交y轴于点C，若S△AOB=2，则k=_________．-九年级数学
• 若点(，)在反比例函数的图象上，则k=。-九年级数学
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• 如图，已知双曲线(x>0)，(x>0),点P为双曲线上的一点，且PA⊥x轴于点A，PA、PO分别交双曲线于B、C两点，则△PAC的面积为()A.1B.1.5C.2D.3-九年级数学
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• 李老师开车从甲地到相距240千米的乙地，如果邮箱剩余油量y（升）与行驶里程x（千米）之间是一次函数关系，其图像如图所示，那么到达乙地时邮箱剩余油量是升．-八年级数学