锟斤拷锟斤拷锟斤拷锟斤拷锟叫兩種锟斤拷锟絰锟斤拷锟斤拷計锟姐方锟斤拷只锟斤拷一锟絅锟斤拷锟斤拷锟角凤拷锟斤拷锟紷锟缴種锟斤拷锟絰锟侥讹拷锟斤拷锟紷锟絅锟斤拷锟斤拷計锟姐。锟斤拷锟絰锟斤拷前锟斤拷l锟斤拷锟斤拷m锟絈n锟斤拷m锟絚n锟斤拷锟斤拷锟斤拷然锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟紹锟斤拷锟叫組锟斤拷c锟斤拷計锟姐方锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷1锟斤拷锟叫組锟斤拷锟斤拷A锟斤拷C锟斤拷么锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷A(n,m)=n×锟斤拷n-1锟斤拷.锟斤拷n-m+1锟斤拷=n!/锟斤拷n-m锟斤拷!(n锟斤拷锟铰橈拷(bi锟斤拷o),m锟斤拷锟较橈拷(bi锟斤拷o),锟斤拷锟斤拷同)

锟斤拷锟斤拷锟組锟斤拷C(n,m)=P(n,m)/P(m,m)=n!/m!锟斤拷n-m锟斤拷!锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷A(4,2)=4!/2!=4*3=12

锟斤拷锟斤拷C(4,2)=4!/(2!*2!)=4*3/(2*1)=6

锟斤拷锟斤拷A32锟斤拷锟斤拷锟斤拷锟斤拷C32锟角組锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷A32锟斤拷锟斤拷3锟斤拷锟斤拷2锟斤拷锟斤拷6

锟斤拷锟斤拷A63锟斤拷锟斤拷6*5*4

锟斤拷锟斤拷锟斤拷锟角從达拷(sh锟斤拷)锟絖始锟剿猴拷锟斤拷锟角傦拷锟斤拷(sh锟斤拷)锟斤拷示锟叫讹拷锟劫傦拷锟斤拷(sh锟斤拷)锟斤拷A72锟斤拷锟斤拷7*6*2锟斤拷锟叫冿拷位A52=5*4

锟斤拷锟斤拷锟斤拷么C32锟斤拷锟斤拷還要锟斤拷锟斤拷一锟斤拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷C32锟斤拷锟斤拷A32锟劫筹拷锟斤拷A22

锟斤拷锟斤拷C53锟斤拷锟斤拷A53锟斤拷锟斤拷A33

锟斤拷锟斤拷2锟組锟较的讹拷锟絰锟斤拷锟斤拷計锟姐公式

锟斤拷锟斤拷锟組锟较的讹拷锟絰锟叫兩種锟斤拷锟斤拷锟絰锟斤拷前锟斤拷l锟斤拷锟斤拷m锟絈n锟斤拷

锟斤拷锟�锟斤拷購锟絥锟斤拷锟斤拷同元锟斤拷锟斤拷锟斤拷锟斤拷取m锟斤拷元锟截诧拷锟斤拷一锟組锟斤拷锟斤拷锟斤拷锟斤拷n锟斤拷锟斤拷同元锟斤拷锟斤拷取锟斤拷m锟斤拷元锟截碉拷一锟斤拷锟組锟较★拷

锟斤拷锟�锟斤拷趶锟絥锟斤拷锟斤拷同元锟斤拷锟叫ｏ拷取锟斤拷m锟斤拷元锟截碉拷锟斤拷锟叫組锟较的傦拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷n锟斤拷锟斤拷同元锟斤拷锟斤拷取锟斤拷m锟斤拷元锟截的組锟较旓拷(sh锟斤拷)锟斤拷

锟斤拷锟�锟斤拷锟斤拷锟斤拷锟斤拷觼锟斤拷锟斤拷舛�锟絰锟斤拷锟斤拷4锟絅锟缴�锟斤拷锟斤拷取锟斤拷2锟絅锟缴�锟斤拷锟斤拷锟轿成讹拷锟劫種锟組锟斤拷锟斤拷

锟斤拷锟斤拷锟解：C(4,2)=A(4,2)/2!={[4x(4-1)x(4-2)x(4-3)x(4-4+1)]/[2x(2-1)x(2-2+1)]}/[2x(2-1)x(2-2+1)]=[(4x3x2x1)/2]/2=6锟斤拷

锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉锟絚锟絉锟斤拷

锟斤拷锟斤拷锟斤拷锟叫旓拷(sh锟斤拷)锟絎(xu锟斤拷)锟饺差數(sh锟斤拷)锟斤拷锟斤拷凸锟绞�

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟斤拷(zh锟斤拷n)锟斤拷锟斤拷志愿锟斤拷锟�锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚

锟組锟斤拷"微锟斤拷"