问题
填空题
若线段AB的两个端点A、B分别在x轴、y轴上滑动,|AB|=60,点M是AB上一点,且|AM|=36,则点M的轨迹方程是__________.
答案
+
=1
设A(x0,0)、B(0,y0)、M(x,y),则x02+y02="3" 600,x0=x,y0=
y.
∴x2+
y2="3" 600,即
+
=1.
若线段AB的两个端点A、B分别在x轴、y轴上滑动,|AB|=60,点M是AB上一点,且|AM|=36,则点M的轨迹方程是__________.
+
=1
设A(x0,0)、B(0,y0)、M(x,y),则x02+y02="3" 600,x0=x,y0=
y.
∴x2+
y2="3" 600,即
+
=1.
阅读理解。 | ||||
| ||||
1. Where are Eric's dictionaries? | ||||
A. On the bed. B. On the sofa. C. On the dresser. D. On the table. | ||||
2. ________ needs tapes. | ||||
A. Eric B. Frank's uncle C. Mona D. Frank's mom | ||||
3. Are Mike's CDs on the table? | ||||
A. Yes, it is. B. Yes, they are. C. No, they aren't. D. No, it isn't. | ||||
4. ________ are on the bed. | ||||
A. Eric's math book and Mike's jacket B. Eric's math book and Frank's jacket C. Mona's math book and Mike's CDs D. Mike's jacket and Frank's tapes | ||||
5. Mike is Linda's _________. | ||||
A. father B. uncle C. grandfather D. brother |