从1~9九个数字中，选四个构成两两相加和相等的等式。相邻两个数的差是2的，如选:1.3.5.7
2+8=4+6绛旓細鎴戠殑 浠1~9涔濅釜鏁板瓧涓,閫夊洓涓瀯鎴涓や袱鐩稿姞鍜岀浉绛夌殑绛夊紡銆傜浉閭讳袱涓暟鐨勫樊鏄2鐨,濡傞:1.3.5.7 鎴戞潵绛 1涓洖绛 #鐑# 涓轰粈涔堝瓟瀛愬儚浼氶洉鍒诲湪缇庢渶楂樻硶闄㈢殑闂ㄦィ涔嬩笂?鐢电殑闃熷皬甯7682 2016-03-25 路 TA鑾峰緱瓒呰繃111涓禐 鐭ラ亾绛斾富 鍥炵瓟閲:119 閲囩撼鐜:97% 甯姪鐨勪汉:32.9涓 鎴戜篃鍘荤瓟棰樿闂釜浜...
绛旓細鍙渶瑕佸湪1.3.5.7鐨勫熀纭涓婃墿澶у氨鑳藉緱鍒帮紝姣忎釜鏁板姞+1寰楀埌锛2.4.6.8,2+8=4+6锛屾瘡涓姞2寰3.5.7.9,3+9=5+7锛屽啀寰鍚庡姞灏辫秴杩9浜嗭紝鎵浠ュ彧鏈夎繖涓ょ粍
绛旓細2345
绛旓細鍏辨湁126绉嶇粍鍚堬紝鐢ㄦ爲鐘跺浘鏉ュ垪锛屼笉瀹规槗鍑洪敊锛佹墍鏈夌殑缁勫悎濡備笅锛1234,1235,1236,1237,1238,1239,1245,1246,1247,1248,1249,1256,1257,1258,1259,1267,1268,1269,1278,1279,1289,1345,1346,1347,1348,1349,1356,1357,1358,1359,1367,1368,1369,1378,1379,1389,1456,1457,1458,1459,1467,1468,1469,1...
绛旓細瑙:浠9涓暟涓浠婚4涓紝鐒跺悗浠庨夊嚭4涓繘琛屾帓鍒楀嵆鍙傜涓姝ラ夊嚭4涓暟:9褏8褏7褏6梅4褏3褏2褏1锛126 绗簩姝ユ妸閫夊嚭4涓暟浠婚2涓帓鍒:4褏3锛12 鍙互缁勬垚姣斾緥鏈:126褏12锛1512
绛旓細鎺掑垪涓庣粍鍚 鍥犱负鎶藉嚭鏉ョ殑鍥涗釜鏁板瓧涓嶅垎椤哄簭 鍗筹細 1锛2锛3锛4鍜4锛3锛2锛1鏄涓涓粍鍚 鎵浠ヨ繖涓粍鍚堥棶棰橈紝灏卞儚涔板僵绁ㄤ竴鏍 鏁板涓婄粍鍚堣绠楁柟娉曟槸 C(4/9)=9!/4!(9-4)!=9*8*7*6/4*3*2*1=126 杩欎釜鍏紡鏄彲浠ヨ瘉鏄庣殑锛岄珮涓鏈氨鏈夈傘傘
绛旓細鑳借9鏁撮櫎鐨勫洓浣嶆暟锛岃〃绀鍥涗釜鏁板瓧鐨勫姞鍜屾槸涔濈殑鍊嶆暟锛1+2+3+4=10,9+8+7+6=30 鎵浠ユ湁18銆27涓ょ鍙兘 18锛1269銆1278銆1359銆1368銆1458銆1467銆2358銆2367銆2457銆3456 27锛3789銆4689銆5679 鎶婃墍鏈夋暟瀛楃粍鍚堝垪鍑哄悗锛屾瘡缁勬湁24绉嶆帓鍒楁柟寮忥紝13x24鍗冲彲銆備娇鍏朵箻绉槸9鐨勫嶆暟锛岃〃绀虹粍鍚堜腑鏈9銆36銆...
绛旓細绗竴绫伙細鏈9 3銆6鍙兘鏈1涓紝鎶3銆6褰撴垚1涓暟锛鎵浠ユ槸1-8鏄7涓暟锛7*6*5/3/2/1=35 鍔犱笂3銆6鐨勫洜绱狅紝35*2=70 绗簩绫伙細鏈3銆6锛屾病鏈9 鍓╀綑鏁板瓧杩樻湁6涓紝6*5/2/1=15 70+15=85
绛旓細棣栧厛涓嶈兘閫1锛鍥犱负缁勬垚鐨勪换浣曟暟閮借兘琚1鏁撮櫎銆傚叾娆″繀椤婚5锛屽洜涓哄鏋滀笉閫5锛岀粍鎴愮殑鏁颁釜浣嶄笉鍙兘鏄0鎴5锛屼笉鑳借5鏁撮櫎銆1锝9涓湁4涓鍋舵暟锛岃繕闇瑕侀夊嚭鐨3涓暟鍗充娇鍏ㄩ夊伓鏁帮紝涔熶細鐣欎笅1涓伓鏁帮紝鑲畾瑕佺暀涓嬫渶灏忕殑鍋舵暟2锛屽洜涓鸿兘琚偅鍑犱釜杈冨ぇ鐨勫伓鏁版暣闄ょ殑鏁颁篃涓瀹氳兘琚2鏁撮櫎銆傜幇鍦ㄧ‘瀹氫簡鐣欎笅1銆2銆3...
绛旓細9閫4锛屼竴鍏辨湁 9!/4!/(9-4)!=126绉嶇粍鍚堛傚啓浜嗕竴娈典唬鐮佽繘琛屼簡鏋氫妇璇曠畻锛屽叾涓彧鏈変袱涓粍鍚堟病鏈夊洓鍒欒繍绠楁柟妗堬紝鍏跺畠閮芥湁瑙ｃ傞檮锛氳绠楃粨鏋滃拰fortran浠ｇ爜
