平面内到定点和定直线距离相等的点的轨迹是椭圆。（） -题库考试答案搜索网

平面内到定点和定直线距离相等的点的轨迹是椭圆。（）

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2021-09-02 13:15

A、√
B、×

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正确答案

B

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标签：含弘慕课贵州遵义师院中学几何研究

感兴趣题目

作圆时，以定点为（），以定长为（）的点的运动轨迹。

（）shall be liable for loss of and damage to the Vessel and／or goods arising or resulting from inaccuracies in stating the description，quantity，weight，measurement or contents.

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

已知椭圆C的中心在坐标原点，焦点在x轴上，椭圆C上的点到焦点距离的最大值为3，最小值为1。（1）求椭圆C的标准方程；（2）若直线Z：y=kx+m与椭圆C相交于A，B两点（A，B不是左右顶点），且以AB为直径的圆过椭圆C的右顶点。求证：直线l过定点，并求出该定点的坐标。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

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（1）求椭圆C的标准方程；
（2）若直线Z：y=kx+m与椭圆C相交于A，B两点（A，B不是左右顶点），且以AB为直径的圆过椭圆C的右顶点。求证：直线l过定点，并求出该定点的坐标。

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