试题与答案

已知直线l:y=kx+1,椭圆E:x29+y2m2=1(m>0).(Ⅰ)若不论k

题型:解答题

题目:

已知直线l:y=kx+1,椭圆E:
x2
9
+
y2
m2
=1(m>0)

(Ⅰ)若不论k取何值,直线l与椭圆E恒有公共点,试求出m的取值范围及椭圆离心率e关于m的函数关系式;
(Ⅱ)当k=
10
3
时,直线l与椭圆E相交于A,B两点,与y轴交于点M.若
AM
=2
MB
,求椭圆E的方程.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:平当日仓盈亏=∑[(当日卖出平仓价-当日买入开仓价)×卖出平仓量]+∑[(当日卖出开仓价-当日买入开仓价)×买入平仓量]=(4030-4000)×20×10=6000(元);当日开仓持仓盈亏=∑[(卖出开仓价-...

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