从2.3.4.5.6中任取2个做底和指数,可以组成多少个幂求大神帮助 从数字1,3,5,6,7中任取2个分别作幂的底数和指数,一共...
\u4ece\u6570\u5b571\u30013\u30015\u30016\u30017\u4e2d\u4efb\u53d62\u4e2a\u5206\u522b\u4f5c\u5e42\u7684\u5e95\u6570\u548c\u6307\u6570\uff0c\u4e00\u5171\u53ef\u4f5c\u51fa\u4e0d\u540c\u7684\u5e42\u7684\u4e2a\u6570\u662f\uff1f \u8bf7\u7ed9\u51fa\u8be6\u7ec6\u7684C(5,1)C(4,1)-3=17
\u89e3\u91ca\uff1a5\u4e2a\u6570\u4e2d\u9009\u4e00\u4e2a\u4f5c\u4e3a\u5e95\u6570\u6709C\uff085,1\uff09\uff0c\u4f59\u4e0b4\u4e2a\u6570\u518d\u9009\u4e00\u4e2a\u5f53\u6307\u6570\u6709C\uff084\uff0c1\uff09.\u53c8\u56e0\u4e3a1\u5f53\u5e95\u6570\u7684\u6709\u56db\u4e2a\u503c\u90fd\u4e3a1,\u6240\u4ee5\u51cf3
\u5e95\u4e3a1\uff0c1\u79cd
\u5e95\u975e1\uff0c4\u4e584
\u603b17
绛旓細C5(2)*2=20,鍙互缁勬垚20涓箓銆傛帓鍒楃粍鍚
绛旓細琚櫎鏁颁负 2鐨勬儏鍐碉紝鑳藉緱鍑2/1,2/3,2/4,2/5,2/6浜斾釜鍟嗭紝浣嗘槸 2/4=1/2, 2/6-1/3 涓庝笂杈归噸澶嶄及鏃犳晥锛屾墍浠ュ張鏈変笁绉嶄笉鍚屽晢 琚櫎鏁颁负 3鐨勬儏鍐碉紝鑳藉緱鍑3/1,3/2,3/4,3/5,3/6 浜斾釜鍟 浣嗘槸 3/6=1/2 閲嶅 浼版棤鏁 鎵浠ュ張鏈夊洓绉嶄笉鍚屽晢 琚櫎鏁颁负 4鐨勬儏鍐碉紝鑳藉緱鍑4/1,4/2...
绛旓細2鍜屽悗闈㈢殑鏁板仛闄ゆ硶锛岀粨鏋滄湁8涓紝3鏈6涓锛4鏈4涓紝5鏈2涓銆傚叾涓2鍜4銆2鍜6銆3鍜6銆4鍜6缁勬垚鐨勬暟鍙互绾﹀垎锛岃垗鍘汇傚嵆灏8涓傚叡鏈1+10+6+4+2-8锛15涓
绛旓細绗竴绉嶆儏鍐碉細2/3,2/5,2/11锛4/5,4/11,6/11,10/11 鍏7绉 绗浜绉嶆儏鍐碉細3/4,3/10锛5/6,5/12,11/12 鍏5绉 绗笁绉嶆儏鍐碉細3/5,3/11,5/11 鍏3绉 鍚堣鍏辨湁锛7+5+3=15绉
绛旓細1~9鏈5涓鏁4涓伓鏁帮紝瑕佷娇涓や釜鏁扮殑鍜屼负鍋舵暟锛屽垯鍙栨暟鏃跺鏁伴厤濂囨暟锛屽伓鏁伴厤鍋舵暟銆傚鏁板彇娉曚负5鍙2鐨勭粍鍚堬紳10锛屽伓鏁板彇娉曚负4鍙2鐨勭粍鍚堬紳6锛屾墍浠ュ叡鏈16绉嶅彇娉
绛旓細鍥炵瓟锛2+3+4+56=65
绛旓細渚濇嵁棰樻剰鍒楀紡璁$畻濡備笅锛2脳3锛6 2脳4=8 2脳6=12 3脳4=12 3脳6=18 4脳6锛24 寰楁暟鏈5绉嶅彲鑳芥с
绛旓細濂囨暟脳鍋舵暟=鍋舵暟锛屽伓鏁懊楀伓鏁=鍋舵暟锛屾墍浠ュ彧鏈変繚璇佹湁涓涓槸鍋舵暟灏卞彲浠ヤ簡锛屾鐜4/9
绛旓細涔樼Н鏈澶х殑鏄632x54=34128 鏈灏忕殑鏄246x35=8610
绛旓細鍙互鎸夌収鍙ゅ吀姒傜巼鐨勭畻娉曡繘琛岃В绛旓細鍙栧埌涓ゆ暟涓哄伓鏁扮殑鏂规硶鏈塁2.3 浠绘剰鍙栧埌涓や釜鏁扮殑鏂规硶鏈塁2.6 鍒欒姹傜殑姒傜巼涓篊2.3/C2.6=0.2