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共找到 154 与890Aonebilliontwohundredandthirty-fourmillionfivehundredsixty-seventhousandeighthundredandninetyBonebilliontwohundredandthirty-fo 相关的结果,耗时5 ms
在△ABC中,点O是AB边上的一个动点,过点O作直线MN//BC,设MN交∠ABC的平分线于点E,交∠ABC的外角平分线于点F(1)求证:EO=FO(2)当点O运动到何处时,四边形AEBF是矩形?请证明你的结论.
其他
如图,在三角形中,点O是AC边上一动点,过点O做直线MN平行BC,设MN交角BCA的平分线于点E,交角BCA外角平分于点F(1)说明EO=FO(2)点O运动到何处时,四边形AECF是矩形?说明理由
数学
如图所示,在△ABC中,点O是AB边上的一个动点,过点O作直线MN∥BC,设直线MN交∠ABC的外角平分线于点F.(1)求证:EO=FO(2)当点O运动到何处时,四边形AEBF是矩形?请证明你的结论如图所示,在△ABC中
数学
,设直线MN交∠ABC的平分
三角形中点O是AB边上的一个动点多点O作直线MN平行BC设MN交∠ABC的平分线于点E,交∠ABC的外角平分线于点FEO=FO当O运动到何处,四边形AEBF为矩形
数学
Choosethebestanswer.()1)Theyalwaysabustothecinemaatweekends.a,byb,onc,seed,take()2)Mumalwaysbuyssomecakeshome.a,onherwaytob,inherwaytoc
英语
_ home.a,on he
Doyouhaveasoccerball?FrankBrown:Idon'thaveasoccerball,butmybrotherAlandoes.Wegotothesameschoolandwelovesoccer.Weplayitatschoolwithourfr
英语
e play it at s
What'sthefurthestyouhaveevercycled?Perhapsyoucycletoschoolortoworkormaybeatmostashortcyclingtripwithfriends?Howwouldyoufeelaboutspendin
英语
ow would you f
What'sthefurthestyouhaveevercycled?Perhapsyoucycletoschoolortoworkormaybeatmostashortcyclingtripwithfriends?Howwouldyoufeelaboutspendin
英语
ow would you f
.完形填空(共20小题,每小题1.5分,满分30分)ManyyoungpeopleintheUnitedStatesneverfinishhighschool.Exactlyhowmanydropoutisanotherissue.Recentstudiesof36ra
英语
issue. Recent
Aturtle(海龟)familywentonapicnic.Theturtlesbeing46slowaboutthingstooksevenyearstopreparefortheir47Finallytheturtlefamilystartedthetripand
英语
Finally the
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