从写有6.7.8.9的四张卡片中有放回各取一张,则两次取到数字和为偶数的概率为 一个盒子中装有5张卡片，每张卡片上写有一个数字，数字分别是1...
\u4ece\u5206\u522b\u5199\u67091\uff0c2\uff0c3\uff0c4\uff0c5\uff0c6\uff0c7\uff0c8\uff0c9\u76849\u5f20\u5361\u7247\u4e2d\uff0c\u4efb\u53d62\u5f20\uff0c\u89c2\u5bdf\u4e0a\u9762\u7684\u6570\u5b57\uff0c\u6c42\u4e0b\u5217\u4e8b\u4ef6\u7684\u6982\u7387\uff1a \uff081\uff09\u89e3\uff1a\u5047\u8bbe\u62bd\u53d6\u5361\u7247\u6709\u5148\u540e\u987a\u5e8f\uff0c\u65e0\u653e\u56de\uff0c\u5219\u57fa\u672c\u4e8b\u4ef6\u4e0e\u70b9\u96c6S={\uff08x\uff0cy\uff09|x\u2208N*\uff0cy\u2208N*\uff0c1\u2264x\u22649\uff0c1\u2264y\u22649\u4e14x\u2260y} \u4e2d\u7684\u5143\u7d20\u4e00\u4e00\u5bf9\u5e94\uff0c\u800cS\u4e2d\u70b9\u7684\u4e2a\u6570\u67099\u00d78=72\uff08\u4e2a\uff09\uff0c\u6240\u4ee5\u57fa\u672c\u4e8b\u4ef6\u603b\u6570\u4e3a72\u4e2a\uff0c\u800c\u672c\u9898\u4e2d\u62bd\u53d6\u5361\u7247\u65e0\u5e8f\uff0c\u6240\u4ee5\u57fa\u672c\u4e8b\u4ef6\u603b\u6570\u4e3a36\u4e2a\uff1b\uff081\uff09\u548c\u4e3a\u5947\u6570\u7684\u6761\u4ef6\u662f\u62bd\u53d6\u7684\u4e24\u4e2a\u6570\u7684\u5947\u5076\u6027\u4e0d\u540c\uff0c\u5373\u4ece1\uff0c3\uff0c5\uff0c7\uff0c9\u4e2d\u53d61\u4e2a\u6570\uff0c\u4ece2\uff0c4\uff0c6\uff0c8\u4e2d\u53d61\u4e2a\u6570\u7684\u60c5\u51b5\uff0c\u4ece1\uff0c3\uff0c5\uff0c7\uff0c9\u4e2d\u62bd\u53d61\u4e2a\u6570\u7684\u60c5\u51b5\u67095\u79cd\uff0c\u4ece2\uff0c4\uff0c6\uff0c8\u4e2d\u62bd\u53d61\u4e2a\u6570\u7684\u60c5\u51b5\u67094\u79cd\uff0c\u6545\u201c\u4e24\u4e2a\u6570\u7684\u548c\u4e3a\u5947\u6570\u201d\u7684\u57fa\u672c\u4e8b\u4ef6\u5171\u67095\u00d74=20\uff08\u4e2a\uff09\uff0c\u6240\u4ee5\u6982\u7387 \uff1b \uff082\uff09\u4e24\u4e2a\u6570\u7684\u79ef\u4e3a\u5b8c\u5168\u5e73\u65b9\u6570\u5305\u62ec1\u00d74\uff0c1\u00d79\uff0c2\u00d78\uff0c4\u00d79 \u5171\u67094\u79cd\u60c5\u51b5\uff0c\u6240\u4ee5\u6982\u7387 \u3002
\uff08\u2160\uff09\u56e0\u4e3a1\uff0c3\uff0c5\u662f\u5947\u6570\uff0c2\u30014\u662f\u5076\u6570\uff0c\u8bbe\u4e8b\u4ef6A\u4e3a\u201c\u4e24\u6b21\u53d6\u5230\u7684\u5361\u7247\u7684\u6570\u5b57\u90fd\u4e3a\u5947\u6570\u6216\u5076\u6570\u201d\uff082\u5206\uff09 P(A)= C 23 + C 22 C 25 = 2 5 \uff084\u5206\uff09\uff08\u2161\uff09\u8bbeB\u8868\u793a\u4e8b\u4ef6\u201c\u6709\u653e\u56de\u5730\u62bd\u53d63\u6b21\u5361\u7247\uff0c\u6bcf\u6b21\u62bd\u53d6\u4e00\u5f20\uff0c\u6070\u6709\u4e24\u6b21\u53d6\u5230\u7684\u5361\u7247\u4e0a\u6570\u5b57\u4e3a\u5947\u6570\u201d\uff0c\uff085\u5206\uff09\u7531\u5df2\u77e5\uff0c\u6bcf\u6b21\u53d6\u5230\u7684\u5361\u7247\u4e0a\u6570\u5b57\u4e3a\u5947\u6570\u7684\u6982\u7387\u4e3a 3 5 \uff0c\uff086\u5206\uff09\u5219 P(B)= C 23 ? ( 3 5 ) 2 ?(1- 3 5 )= 54 125 \uff088\u5206\uff09\uff08\u2161\uff09\u4f9d\u9898\u610f\uff0cX\u7684\u53ef\u80fd\u53d6\u503c\u4e3a1\uff0c2\uff0c3\uff0e P(X=1)= 3 5 \uff0c P(X=2)= 2\u00d73 5\u00d74 = 3 10 \uff0c P(X=3)= 2\u00d71\u00d73 5\u00d74\u00d73 = 1 10 \uff0c\uff0811\u5206\uff09\u6240\u4ee5X\u7684\u5206\u5e03\u5217\u4e3a X 1 2 3 P 3 5 3 10 1 10 E(X)=1\u00d7 3 5 +2\u00d7 3 10 +3\u00d7 1 10 = 3 2 \uff0e\uff0813\u5206\uff09
绛旓細鎴戠殑 浠庡啓鏈6.7.8.9鐨勫洓寮犲崱鐗涓湁鏀惧洖鍚勫彇涓寮,鍒欎袱娆″彇鍒版暟瀛楀拰涓哄伓鏁扮殑姒傜巼涓 鎴戞潵绛 1涓洖绛 #鐑# 钃濇磥鐟涚敓鍓嶅彂鐢熶簡浠涔?maths_hjxk 2015-02-04 路 鐭ラ亾鍚堜紮浜烘暀鑲茶瀹 maths_hjxk 鐭ラ亾鍚堜紮浜烘暀鑲茶瀹 閲囩撼鏁:9803 鑾疯禐鏁:18807 姣曚笟鍘﹂棬澶у姒傜巼璁轰笌鏁扮悊缁熻涓撲笟 纭曞＋瀛︿綅 鍚慣A鎻愰棶 绉...
绛旓細2.3.4.5.6.7.8.9鐢鍗＄墖鐨勬暟缁勬垚4涓袱浣嶆暟姣忎釜鏁板瓧鍙敤涓娆,浣垮叾涓2涓暟鐨勫拰涓 (1)23+98=45+76 (2) 32+89=54+67 (3)29+56锛38+47 (4)26+59=38+47 (5)26+59=37+48
绛旓細8769 6寮澶寸殑鏈灏忥紝鍏辨湁A(3,3)=6涓紱 7寮澶寸殑鍏舵锛屼篃鏈堿(3,3)=6涓紱 鎺ヤ笅鏉ユ槸8寮澶寸殑锛屼篃鏈堿(3,3)=6涓 鎵浠ョ15涓暟瀛楁槸8寮澶寸殑绗笁灏忕殑鏁板瓧銆 8寮澶寸殑浠庡皬鍒板ぇ鏄8679锛8697锛8769锛8796锛8967锛8976锛 鎵浠ョ15涓槸8769 ...
绛旓細杩欏洓涓暟锛岄鍏堢煡閬6+9绛変簬7+8绛変簬15銆備篃灏辨槸璇磋繖涓6+9=7+8锛 杩欎釜鏌垮瓙鍙互鏈夊洓绉嶅彉褰紝涔熷氨鏄6绛変簬7+8-9銆9绛変簬7+8-6锛7绛変簬6+9-8锛 8绛変簬6+9-7杩欏洓绉
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绛旓細閫6鏈3涓拰锛 13锛14,15 3涓Н 42,48,54锛岄7鏈2涓拰锛 15,16 2涓Н56,63 閫8鏈1涓拰锛 17 1涓Н72 鍘绘帀鐩稿悓鐨勭粨鏋滄眰鍜屾湁5绉嶅彲鑳姐傛眰绉6绉嶅彲鑳姐傚悎璧锋潵11绉
绛旓細绛旀 29 38 47 56 姣忕粍鏁扮浉鍔犻兘涓11 鏈涢噰绾
绛旓細6.7.8.9姹傜瓟妗堛傚啓杩囩▼ 鎴戞潵绛 1涓洖绛 #璇濋# 鎵撳伐浜哄繀鐪嬬殑鑱屽満銆庣淮鏉冦忔寚鍗!鍖垮悕鐢ㄦ埛 2014-11-01 灞曞紑鍏ㄩ儴 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 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 涓轰綘鎺ㄨ崘:鐗瑰埆鎺ㄨ崘 鍒绘剰闅愮瀿涓闄╁湴鍖鸿绋,灏嗚礋鍝簺娉曞緥璐ｄ换? 鎵撳伐浜虹殑鈥滄儴鈥濇槸璋侀犳垚鐨? 浜斾竴鍋囨湡楂橀熷厤璐规槸鎸...
绛旓細6鍜8涓2閫1浣滀负涓綅锛岀劧鍚庡墿涓嬬殑3涓暟浣滀负鍗佷綅锛2*3=6
绛旓細浜掔浉骞宠 闀挎柟褰 姝ｆ柟褰 鏈 涓嶆槸
