已知点P是曲线C： x24 ﹣y2=1上的任意一点，直线l：x=2与双曲线C的渐近线交于A，B两点，若 OP→ =λ OA→ +μ OB→ ，（λ，μ∈R，O

题干

已知点P是曲线C：

x

2

4

﹣y²=1上的任意一点，直线l：x=2与双曲线C的渐近线交于A，B两点，若 OP→ =λ OA→ +μ OB→ ，（λ，μ∈R，O为坐标原点），则下列不等式恒成立的是（）

A：λ²+μ²≥ $\frac{1}{2}$

B：λ²+μ²≥2

C：λ²+μ²≤ $\frac{1}{2}$

D：λ²+μ²≤2

上一题下一题 0.0难度选择题更新时间:2019-04-16 10:49:52

答案(点此获取答案解析）

A

同类题1

阅读理解。

My name is Jim. My favorite day is October 18th, because it's my birthday. I am very happy on that day. I eat eggs for breakfast. Then my friends come to my home and play with me. We sing and dance. Someone plays the piano and someone plays the guitar. Lunch is very nice. After lunch, my parents take me to see a movie. My favorite movies are comedies and action movies. After supper, my parents, my sister and I watch TV. Then I go to bed at ten thirty. I don't do my homework on that day. I am very tired but happy on my birthday。

题干

答案(点此获取答案解析）

同类题1

同类题2

同类题3

同类题4

同类题5