问题
填空题
中心在原点，对称轴为坐标轴的双曲线的渐近线方程为y=±x，且双曲线过点P（2，1），则双曲线的标准方程为______．
答案
因为双曲线的渐近线方程为y=±x，
所以设曲线的标准方程为x2-y2=λ
因为双曲线过点P（2，1），
所以λ=3
所以曲线的标准方程为x2-y2=3．
故答案为x2-y2=3．
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中心在原点，对称轴为坐标轴的双曲线的渐近线方程为y=±x，且双曲线过点P（2，1），则双曲线的标准方程为______．
因为双曲线的渐近线方程为y=±x，
所以设曲线的标准方程为x2-y2=λ
因为双曲线过点P（2，1），
所以λ=3
所以曲线的标准方程为x2-y2=3．
故答案为x2-y2=3．
| 短文改错。 | |
| I have a good friend who's name is Liu Mei. She is our monitor and one of the excellent student in our class. Clever as she is, but she words very hard.We have a lot on common and have a lot to talk about. One evening she told me that something happened when her parents was out. She was doing her homeworks one Sunday morning when she smelt something burning. Shen stopped look out of the window and find a cloud of smoke coming out of her neighbor's house. She called 119 immediate. Ten minutes later, the firemen came and put out fire. Her neighbor was very thankful for her help. | 1._____ 2._____ 3._____ 4._____ 5._____ 6._____ 7._____ 8._____ 9._____ 10._____ |