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绛旓細灞曞紑鍏ㄩ儴 鍝釜搴勫鍗栧叚涓叚,浜斾腑浜?鍥涗腑鍥涢兘宸茬粡澶ц繃澶╀簡銆傚憡璇変綘鍚,鍏釜鏁:浜屼腑浜15缁,涓変腑涓20缁,鍥涗腑鍥25缁勩 杩界瓟 鍗佷簩涓鏁板寮,鍚撳憜浣,浜屼腑浜66缁勩備笁涓笁220缁,鍥涗腑鍥495缁勩 鏈洖绛旇缃戝弸閲囩撼 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 1鏉℃姌鍙犲洖绛 鍏朵粬绫讳技闂2015...
绛旓細绛旀鏄:12.36.25浜屼腑浜澶氬皯缁 涓夌粍 12銆36銆25浜屼腑浜屾湁涓夌粍銆傝绠楁柟娉曞涓:鍏紡:浜屼腑浜岀殑缁勬暟=n(n-1)梅2,n浠ｈ〃鏁扮殑鏁伴噺銆備唬鍏ュ叕寮:3(3-1)梅2=3銆傚緱鍒扮粨鏋12銆36銆25浜屼腑浜屾湁涓夌粍銆
绛旓細45缁 涓や釜鍙风爜涓缁 3涓 灏辨槸3缁4涓 灏辨槸6缁 濡傛灉10鍏冧竴缁 锛600锛 4涓彿鐮 浣犺繕涓簡涓缁勪笁涓笁
绛旓細澶嶅紡浜屼腑浜鏄寚鍦ㄥ彿鐮佹睜涓夊彇涓や釜鏁板瓧锛屽叾涓换鎰忎袱涓暟瀛楃殑缁勫悎閮藉彲浠ユ垚涓轰竴娉ㄥ僵绁ㄣ傚洜姝わ紝澶嶅紡浜屼腑浜岀殑缁勫悎鏁伴噺涓猴細C(n,2)锛屽叾涓璶涓哄彿鐮佹睜涓殑鍙风爜鏁伴噺銆備緥濡傦紝鍋囪鍙风爜姹犱腑鏈10涓暟瀛楋紝閭ｄ箞澶嶅紡浜屼腑浜岀殑缁勫悎鏁伴噺涓猴細C(10,2) = 45鍥犳锛屾湁45缁勬暟瀛楀彲浠ョ粍鎴愪竴娉ㄥ寮忎簩涓簩鐨勫僵绁ㄣ
绛旓細10涓暟澶嶅紡浜屼腑浜澶氬皯缁勫彲浠ヨ繖鏍疯绠楋細瀵逛簬10涓暟锛屼粠涓夊嚭2涓暟鐨勭粍鍚堟暟涓10閫2锛屽嵆C(10,2)銆傚浜庡寮忎簩涓簩鐨勫舰寮忥紝姣忕粍涓湁涓や釜鏁伴兘蹇呴』琚変腑锛屽洜姝ら変腑鐨2涓暟涓嶈兘閲嶅閫夋嫨銆傚洜姝わ紝璁＄畻澶嶅紡浜屼腑浜岀殑缁勫悎鏁版椂锛岄渶瑕佸湪10閫2鐨勫熀纭涓婇櫎浠2锛屽嵆C(10,2)/2銆傜畝鍖栧悗锛屽寮忎簩涓簩鐨勭粍鍚堟暟涓篊...
绛旓細10缁勩傚寮5涓暟浜屼腑浜锛屽氨鏄粠5涓暟瀛椾腑閫夊彇2涓暟瀛楄繘琛岀粍鍚堬紝杩欐槸涓涓吀鍨嬬殑缁勫悎闂锛屽彲浠ヤ娇鐢ㄧ粍鍚堝叕寮忔潵璁＄畻锛屽洜姝わ紝澶嶅紡5涓暟浜屼腑浜屾湁10缁勩
绛旓細45缁勩10涓彿鐮佸寮浜屼腑浜鏄寚浠10涓彿鐮佷腑閫夋嫨2涓彿鐮佷綔涓轰竴缁勶紝涓鍏卞彲浠ョ粍鎴45缁勩傝绠楁柟娉曚负绠楀嚭浠10寮濮嬪線鍓嶄袱涓暟鐨勭Н109绛変簬90锛屼粠1寮濮嬪線鍚庝袱涓暟鐨勭Н21绛変簬2锛屼袱涓暟鐨勫晢涓虹粍鏁90闄や互2绛変簬45銆
绛旓細杩欑鏁板瓧澶嶅紡浜屼腑浜鏈36缁勩傞氳繃缁勫悎鏁板涓殑鍏紡C锛坣锛宬锛夎绠楀緱鍑虹殑锛宯浠ｈ〃鎬荤殑鏁板瓧鏁伴噺锛宬浠ｈ〃閫夊彇鐨勬暟瀛楁暟閲忋俷涓9锛堝洜涓烘湁9涓暟瀛楋級锛宬涓2锛堝洜涓洪渶瑕侀夊彇2涓暟瀛楄繘琛岀粍鍚堬級銆傞氳繃浠ｅ叆鍏紡杩涜璁＄畻锛屽彲浠ュ緱鍒扮粨鏋滀负36缁勩傛剰鍛崇潃浠9涓笉鍚岀殑鏁板瓧涓夊彇2涓暟瀛楀苟杩涜缁勫悎锛屾诲叡鏈36绉嶄笉鍚岀殑缁勫悎...
绛旓細21缁勩備簩鑲浜屼腑浜鐨勫寮忕畻娉曟槸濂囨暟鐨勮瘽锛屽氨鎶婂寮忎釜鏁板垎涓や唤锛屽彇灏忕殑鏁颁箻浠ュ寮忎釜鏁扮瓑浜庣粍鏁版墍浠ワ紝鎶7鍒嗕袱浠斤紝寰3鍜4锛屽嵆3涔樹互7绛変簬21缁勩
绛旓細鍗佷釜鏁板瓧鐨勫寮浜屼腑浜缁勫悎鏁拌绠楀涓嬶細棣栧厛锛屼粠鍗佷釜鏁板瓧涓夋嫨涓や釜鏁板瓧鐨勭粍鍚堟暟鏄崄閫変簩锛屽嵆C(10,2)銆傜劧鑰岋紝澶嶅紡浜屼腑浜岃姹傛瘡涓粍鍚堜腑鐨勪袱涓暟瀛椾笉鑳介噸澶嶏紝鍥犳鎴戜滑闇瑕佸皢鍗侀変簩鐨勭粍鍚堟暟闄や互2锛屼互娑堥櫎閲嶅璁＄畻銆傚洜姝わ紝澶嶅紡浜屼腑浜岀殑缁勫悎鏁颁负C(10,2) / 2锛岀畝鍖栧悗涓45缁勩傜浉鍏虫嫇灞曪細1. 澶嶅紡浜屼腑浜...
