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双曲线的两个焦点是F1,F2,过F1作垂直于实轴的弦PQ,若∠PF2Q=90°,则该双曲线的离心率为( ).
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以下程序可将磁盘中的一个文件复制到另一个文件中两个文件的文件名在可执行命令的命令行中相当于COPY命
已知F.1F.2为双曲线=1a>0b>0的焦点过F.2作垂直于x轴的直线交双曲线于点P.和Q..且△
过双曲线的一个焦点F.2作垂直于实轴的弦PQF.1是另一焦点若∠则双曲线的离心率e等于
若力F1F2在某一轴上的投影相等这两个力大小一定相等
已知F.1F.2是双曲线的两个焦点过F.1作垂直于x轴的直线与双曲线相交一个交点为P.则|PF2|=
6
4
2
1
有一个合力F=1000N将其分解成两个分力F1F2F1与合力夹角30°F2与合力夹角45°画出分力图
已知两个力F1F2F1=300NF2=400N且F1与F2夹角为90°求合力R 的大小
已知F.1F.2为双曲线-=1a>0b>0的焦点过F.2作垂直于x轴的直线交双曲线于点P.和Q..且
双曲线的虚轴端点与一个焦点连线的中点恰在双曲线的一条准线上PQ是双曲线的一条垂直于实轴的弦o为坐标原
0
-1
1
现PQ的位置及a的值有关
F1F2为两个分力两者之间的夹角为αF1与F2的合力为F则F=
本题共有2个小题第1小题满分6分第2小题满分8分 双曲线的左右焦点分别为F1F2直线l过F2且与双
设P.为直线y=x与双曲线-=1a>0b>0左支的交点F1是左焦点PF1垂直于x轴则双曲线的离心率e
计算题已知两个力F1F2F1=300NF2=400N且F1与F2夹角为90°求合力R的大小
双曲线的两个焦点是F1F2过F1作垂直于实轴的弦PQ若∠PF2Q=90°则该双曲线的离心率为.
A
B
C
D
已知F.1F2是双曲线的两个焦点以线段F.1F2为边作正三角形MF1F2若边MF1的中点在此双曲线上
运动员用双手握住竖直的滑杆匀速上攀和匀速下滑时运动员所受到的摩擦力分别是f1和f2那么.【2】
)f1向下,f2向上,且f1=f2
(
)f1向下,f2向上,且f1>f2(
)f1向上,f2向上,且f1=f2
(
)f1向上,f2向下,且f1=f2
双曲线 b∈N+的焦点是F1F2P是双曲线上的一点满足|OP|<5且|PF1||F1F2||PF2
如图所示F1F2是双曲线a>0b>0的两个焦点以坐标原点O.为圆心|OF1|为半径的圆与该双曲线左支
,B,且ΔF2AB是等边三角形,则双曲线的离心率为 A.
( )
双曲线a>0b>0的两个焦点为F1F2若点P为其上一点且|PF1|=2|PF2|则双曲线离心率e的取
e
1<e<3
e
1<e≤3
e
e>3
e
e≥3
如图所示圆锥体重为G悬浮在水中时受到水对它向上的压力为F1向下的压力为F2这两个力之间的关系是:
F1> F2 ;
F1=F2;
F1 <F2;
无法判断.
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ItzhakPerlmanwasborninIsrael.Buthismusichasmadehimacitizenoftheworld.Hehasplayedin16everylargecity.HehaswonfifteenGrammyAwardsandfourEmmys. Perlmansufferedaterriblediseasewhichhurthis17atfour.Todayheusesawheelchairorwalkswithcrutches拐杖.Butnoneofthese18himfromplayingtheviolin.AsayoungchildhetookhisfirstlessonsattheMusicAcademyofTelAviv.Veryquicklyhis16talentwasrecognized.AttheageofthirteenhewenttotheUnitedStatesto20ontelevision.HisplayingledhimtotheJuilliardSchoolinNewYork. Hismusicisfullofpowerandstrength.Itcanbe21orjoyfulloudorsoft.Butpeoplesayitisnotthemusic22thatmakeshisplayingsoparticular.Theysayheisabletoshowthejoyhe23inplayingandthefeelingsthatgreatmusiccanexpress. Anyonewhohasattended出席hisperformancewilltellyouitisexcitingtowatchhimplay.Hisfacechanges24themusicfromhisviolinchanges.Hesmilesandcloseshiseyeswhenthemusicislightandhappy.Heoften25darkwhenthemusicseemsdarkandfrightening. ItzhakPerlmanhasreceivedmanyhonoursandcontinuestoreceivehonoursforhismusic. 19.
ItzhakPerlmanwasborninIsrael.Buthismusichasmadehimacitizenoftheworld.Hehasplayedin16everylargecity.HehaswonfifteenGrammyAwardsandfourEmmys. Perlmansufferedaterriblediseasewhichhurthis17atfour.Todayheusesawheelchairorwalkswithcrutches拐杖.Butnoneofthese18himfromplayingtheviolin.AsayoungchildhetookhisfirstlessonsattheMusicAcademyofTelAviv.Veryquicklyhis16talentwasrecognized.AttheageofthirteenhewenttotheUnitedStatesto20ontelevision.HisplayingledhimtotheJuilliardSchoolinNewYork. Hismusicisfullofpowerandstrength.Itcanbe21orjoyfulloudorsoft.Butpeoplesayitisnotthemusic22thatmakeshisplayingsoparticular.Theysayheisabletoshowthejoyhe23inplayingandthefeelingsthatgreatmusiccanexpress. Anyonewhohasattended出席hisperformancewilltellyouitisexcitingtowatchhimplay.Hisfacechanges24themusicfromhisviolinchanges.Hesmilesandcloseshiseyeswhenthemusicislightandhappy.Heoften25darkwhenthemusicseemsdarkandfrightening. ItzhakPerlmanhasreceivedmanyhonoursandcontinuestoreceivehonoursforhismusic. 23.
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