若以连续掷两次骰子分别得到的点数 作为点 的坐标，则点 落在圆 内的概率为（ ） A． B． 若以连续抛掷两次骰子分别得到的点数m、n作为点P的坐标，则点...
\u82e5\u4ee5\u8fde\u7eed\u63b7\u4e24\u6b21\u9ab0\u5b50\u5206\u522b\u5f97\u5230\u7684\u70b9\u6570m\uff0cn\u4f5c\u4e3a\u70b9P \u7684\u5750\u6807\uff0c\u5219\u70b9P\u843d\u5728\u5706 \u5185\u7684\u6982\u7387\u4e3a ...\u8fde\u7eed\u63b7\u4e24\u6b21\u9ab0\u5b50\u5206\u522b\u5f97\u5230\u7684\u70b9\u6570m\uff0cn\u7ec4\u6210P(m,n)\u670936\u4e2a.\u5176\u4e2dP(m,n)\u5728\u5706 \u5185\u7684\u6709(1,1),(1,2),(1,3),(2,1),(2,2),(2,3),(3,1),(3,2)\u51718\u4e2a.\u5219 .
\u7531\u9898\u610f\u77e5\u662f\u4e00\u4e2a\u53e4\u5178\u6982\u578b\uff0c\u2235\u7531\u5206\u6b65\u8ba1\u6570\u539f\u7406\u77e5\u8bd5\u9a8c\u53d1\u751f\u7684\u603b\u4e8b\u4ef6\u6570\u662f6\u00d76\uff0c\u800c\u70b9P\u843d\u5728\u5706x2+y2=16\u5185\u5305\u62ec\uff081\uff0c1\uff09\uff081\uff0c2\uff09\uff081\uff0c3\uff09\uff082\uff0c1\uff09\uff082\uff0c2\uff09\uff082\uff0c3\uff09\uff083\uff0c1\uff09\uff083\uff0c2\uff09\u51718\u79cd\uff0c\u7531\u53e4\u5178\u6982\u578b\u516c\u5f0f\u5f97\u5230P=86\u00d76=29\uff0c\u6545\u9009A\uff0e
| A Ab的中间。 绛旓細A 璇曢鍒嗘瀽锛鑻ヤ互杩炵画鎺蜂袱娆￠瀛愬垎鍒緱鍒扮殑鐐规暟 浣滀负鐐 鐨勫潗鏍囷紝鍏舵墍鏈夌殑缁撴灉涓猴細 锛屽叡36绉嶏紝婊＄偣 钀藉湪鍦 鍐呯殑鏈 鍏8绉嶏紝鎵鏈夊叾姒傜巼涓 銆傜偣璇勶細鏈鑰冩煡鐢ㄥ垪涓炬硶璁＄畻鍩烘湰浜嬩欢鏁板強闅忔満浜嬩欢鍙戠敓鐨勬鐜囷紝瑙ｉ鐨勫叧閿槸鐔熺粌杩愮敤鍒嗙被鍒椾妇鐨勬柟娉曞強浜嬩欢鐨勬ц川灏嗘墍鏈夌殑鍩烘湰浜嬩欢涓涓鍒椾妇鍑烘潵锛岃繍鐢... 绛旓細C 瑙ｏ細鐢遍鎰忕煡锛屾湰棰樻槸涓涓彜鍏告鍨嬶紝璇曢獙鍙戠敓鍖呭惈鐨勪簨浠舵槸杩炵画鎺蜂袱娆￠瀛愬垎鍒緱鍒扮殑鐐规暟m銆乶浣滀负鐐筆鐨勫潗鏍囷紝鍏辨湁6脳6=36绉嶇粨鏋滐紝鑰屾弧瓒虫潯浠剁殑浜嬩欢鏄偣P钀藉湪鍦唜 2 +y 2 =16鍐咃紝鍒椾妇鍑鸿惤鍦ㄥ渾鍐呯殑鎯呭喌锛氾紙1锛1锛夛紙1锛2锛夛紙1锛3锛夛紙2锛1锛夛紙2锛2锛夛紙2锛3锛夛紙3锛1锛夛紙3锛2锛... 绛旓細(1) 锛(2) 銆 璇曢鍒嗘瀽锛氾紙1锛 1 2 3 4 5 6 1 2 3 4 5 6 7 2 3 4 5 6 7 8 3 4 5 6 7 8 9 4 5 6 7 8 9 10 5 6 7 绛旓細P=8/36=2/9 绛旓細璇曢鍒嗘瀽锛杩炵画鎶涙幏涓ゆ楠板瓙鍑虹幇鐨勭粨鏋滃叡鏈6脳6=36锛屽叾涓瘡涓粨鏋滃嚭鐜扮殑鏈轰細閮芥槸绛夊彲鑳界殑锛岀偣P锛坢锛宯锛夊湪鐩寸嚎x+y=4涓婂寘鍚殑缁撴灉鏈夛紙1锛3锛夛紝锛2锛2锛夛紝锛3锛1锛夊叡涓変釜锛屾墍浠ョ偣P锛坢锛宯锛夊湪鐩寸嚎x+y=4涓婄殑姒傜巼鏄 鐐硅瘎锛氭绫婚棶棰樺厛鍒ゆ柇鍑哄悇涓粨鏋滄槸绛夊彲鑳戒簨浠讹紝鍐嶅埄鐢ㄥ彜鍏告鍨嬬殑姒傜巼鍏紡姹... 绛旓細鐢遍鎰忓彲鐭ワ紝璇ュ渾鐨勫崐寰勪负4锛岃嫢鐐筽钀藉湪鍦嗗锛屽垯锛坢 銆4锛宯 銆4锛杩炵画鎺蜂袱娆￠瀛锛屽彲寰楋紙1锛1锛夛紙1锛2锛夛紙1锛3锛夛紙1锛4锛夛紙1锛5)锛1锛6锛夛紙2锛1锛夛紙2锛2锛夛紙2锛3锛夛紙2锛4锛夛紙2锛5锛夛紙2锛6锛夛紙3锛1锛夛紙3锛2锛夛紙3锛3锛夛紙3锛4锛夛紙3锛5锛夛紙3锛6锛... 绛旓細璇曢鍒嗘瀽锛氫互杩炵画鎺蜂袱娆￠瀛愬垎鍒緱鍒扮殑鐐规暟 浣滀负鐐 鐨勬í銆佺旱鍧愭爣锛岃繖鏍风殑缁撴灉鍏辨湁36涓紝鍏朵腑浣 鐨勬湁 鍏4涓紝鏍规嵁鍙ゅ吀姒傚瀷鐨勮绠楁柟娉曠煡锛屾墍姹傜殑姒傜巼涓 . 绛旓細1/6 鍙互鐢讳釜缃戞牸鍥俱傛壘鐐瑰氨濂姐傚湪涓嬫柟鏈6涓偣銆備竴鍏辩殑鍙兘鎬т负36銆傛墍浠ャ傘 绛旓細鑳藉鍧愯惤鍦ㄥ渾鍐呯殑鍧愭爣鍖呮嫭 X=1鏃讹紝Y=1,2,3 X=2鏃讹紝Y=1,2,3 X=3鏃讹紝Y=1,2 鍏辨湁鍏釜鐐瑰彲浠ヨ惤鍦ㄥ渾鍐咃紝杩炵画鎺蜂袱娆￠瀛鏈6*6绉嶆柟娉曪紝鎵浠寰楀埌鐨姒傜巼鏄8/36=2/9 绛旓細濡傛灉鍦嗙殑杈圭紭绠楀渾鍐呯殑璇4/6 * 4/6 = 4/9 濡傛灉涓嶇畻鐨勮瘽3/6 * 3/6 = 1/4 本站交流只代表网友个人观点，与本站立场无关 |
