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“捕鱼达人”免费赚金赛
门票：1金币
（玩家持有金币量小于30万金币可以进入）
重新挑战费：1000金币/次
重新挑战次数1次
免费赚金赛（1）、（2）
5万奖券+8万金币+2张宝石日赛券
2万奖券+5万金币+2张宝石日赛券
5000奖券+4万金币+2张宝石日赛券
2000奖券+2万金币+1张宝石日赛券
第31-100名
1000奖券+1万金币+1张宝石日赛券
第101-350名
500奖券+5000金币
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Copyright 2009 All Rights Reserved 力港科技 | 老K游戏出品
健康游戏忠告：抵制不良游戏 拒绝盗版游戏 注意自我保护 谨防受骗上当 适度游戏益脑 沉迷游戏伤身 合理安排时间 享受健康生活 本平台游戏仅适合18岁以上人群已知椭圆C：x^2/a^2+y^2/b^2=1(a＞b＞0)，其中一个顶点坐标为B(0，1)，且P(-√6/2，1/2)在椭圆C上（1）求椭圆C的方程（2）若直线y=lx=m与椭圆C交于M,N，且k(OM)+k(ON)=4k，求证m^2为定值求详细过程！谢谢_百度作业帮
拍照搜题，秒出答案
已知椭圆C：x^2/a^2+y^2/b^2=1(a＞b＞0)，其中一个顶点坐标为B(0，1)，且P(-√6/2，1/2)在椭圆C上（1）求椭圆C的方程（2）若直线y=lx=m与椭圆C交于M,N，且k(OM)+k(ON)=4k，求证m^2为定值求详细过程！谢谢
已知椭圆C：x^2/a^2+y^2/b^2=1(a＞b＞0)，其中一个顶点坐标为B(0，1)，且P(-√6/2，1/2)在椭圆C上（1）求椭圆C的方程（2）若直线y=lx=m与椭圆C交于M,N，且k(OM)+k(ON)=4k，求证m^2为定值求详细过程！谢谢！直线y=kx+m...打错了
由A(2,0)可得:a=2,离心率e=c/a=c/2=√2/2,∴c=√2,b=√(a^2-c^2)=√2,∴椭圆方程为:x^2/4 +y^2/2=1,设M(x1，y1)，N(x2，y2)联立直线椭圆，得：(1+2k²)x² - 4k²x+2k²-4=0x1+x2=4k²/(1+2k²)，x1x2=(2k²-4)/(1+2k²)|MN|=√[(x1-x2)²+(y1-y2)²]
=√{ (x1-x2)² + [k(x1-1) - k(x2-1)]² }=√[(x1-x2)² + k²(x1-x2)²]=√[(1+k²)(x1-x2)²]=√{ (1+k²)[(x1+x2)² - 4x1x2]=√{ (1+k²)[16k^4/(1+2k²)²
4(2k²-4)/(1+2k²) ] }
=√[(1+k²)(24k²+16)/(1+2k²)² ]A点到直线距离为h=|k|/√(1+k²)∴S=(1/2)·h·|MN|=(1/2)·[|k|/√(1+k²)] ·√[(1+k²)(24k²+16)/(1+2k²)² ]=(1/2)·|k|·√[(24k²+16)/(1+2k²)²]=√10/3即：|k|·√[(24k²+16)/(1+2k²)²] = 2√10/3两边平方，得：(24k^4 + 16k²)/(1+2k²)² = 40/9即：7k^4 - 2k² - 5=0解得：k²=1或-5/7 (舍去)∴k²=1∴k=±1中华成人电影在线 乱伦图片网,www.vip.xxx
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