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甲、乙、丙、丁4个人站成一横排，若甲必须站在乙左边，则共有站法(用数字作答)______种．
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若甲乙丙三人随机地站成一排则甲乙两人相邻而站的概率为______________.
六人按下列要求站一横排分别有多少种不同的站法1甲不站两端2甲乙必须相邻3甲乙不相邻数字作答
若甲乙丙三人随机地站成一排则甲乙两人相邻而站的概率为__________．
.甲乙丙丁四人站成一排甲不站在排尾的站法共有种.用数字作答
甲乙丙3人随机站成一排甲站在中间的概率为.
若甲乙丙三人随机地站成一排则甲乙两人相邻而站的概率为__________.
五个人站成一排求在下列条件下的不同排法种数用数字作答1甲乙两人相邻2甲乙两人不相邻3甲不在排头并且乙
甲乙丙丁三人站成一排甲必须站在排头一共有种排法
6
8
4
甲乙丙丁戊五人并排站成一排如果甲必须站在乙的右边甲乙可以不相邻那么不同的排法共有
24种
60种
90种
120种
甲乙丙丁四人站成一排则甲乙相邻甲丙不相邻有___________种排法.
五个人站成一排求在下列条件下的不同排法种数用数字作答 1甲乙两人相邻 2甲乙两人不相邻 3甲不在排
若甲乙丙三人随机地站成一排则甲乙两人相邻而站的概率为.
六人按下列要求站一横排分别有多少种不同的站法l甲不站两端2甲乙不相邻3甲乙之间间隔两人4甲不站左端乙
甲乙丙丁四人站成一排照相甲不站在最左端且乙不站在最右端的不同站法有种
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设函数若fa=2则实数a=．
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Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater.Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed.AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthereisbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey.Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown.Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody.Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater.Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb.Thewriterdescribesthespecialspiderasspecialbecause______.
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双曲线的准线方程是．
Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater.Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed.AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthereisbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey.Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown.Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody.Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater.Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb.Thepurposeofthepassageisto______.
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