数学题“为了解中职一年级男生的身体素质情况，对某中职学校24名一年级男生进行每 某学校为了解学生的身体素质情况，对学生进行体能检测，现从15...
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统计，求中位数独个击破
抽样调查
绛旓細缁熻锛屾眰涓綅鏁
绛旓細锛2锛墆-0=(0-2)/(1-3)*(x-1)y=x-1 锛3锛夌洿绾緽C鐨勬枩鐜囦负1 鎵浠C杈逛笂鐨勯珮绾跨殑鏂滅巼涓-1 y-0=-1*(x+1)y=-x-1
绛旓細涓ょ洿绾垮瀭鐩达紝鏂滅巼涔嬬Н涓-1 璁颁笉涓嬫潵涔熷緱璁
绛旓細寮鍖洪棿锛氭弧瓒充笉绛夊紡a<x<b鐨勬墍鏈夊疄鏁扮殑闆嗗悎锛屽彨寮鍖洪棿锛岃浣(a锛宐)銆傚湪鏁拌酱涓婄敤浠嬩簬a锛宐涓ょ偣涔嬮棿鑰屼笉鍖呮嫭绔偣鐨勪竴鏉＄嚎娈典笂鎵鏈夌殑鐐硅〃绀恒傞棴鍖洪棿锛氭弧瓒充笉绛夊紡a<x<b鐨勬墍鏈夊疄鏁扮殑闆嗗悎锛屽彨寮鍖洪棿锛岃浣淸a锛宐].鍦ㄦ暟杞翠笂鐢ㄤ粙浜巃锛宐涓ょ偣涔嬮棿鑰屽寘鎷鐐圭殑涓鏉＄嚎娈典笂鎵鏈夌殑鐐硅〃绀恒傚崐寮鍗婇棴鍖洪棿锛氭弧瓒...
绛旓細鍥炵瓟锛氫护x=0,y=-4, 浠=0,x=4
绛旓細绛夊樊鏁板垪鐨勫墠n椤瑰拰鍏紡鍜岀瓑宸暟鍒楃殑閫氶」鍏紡鐨勫簲鐢
绛旓細鍏樊 d=(a12-a5)/(12-5) = (31-10)/(12-5) = 3锛岄椤 a1 = a5-4d = 10-12 = -2
绛旓細璁緋(x,0)鎵浠=l3x+6l/5=6 x=8鎴-12 鎵浠(8,0)鎴栵紙-12锛0锛夊洜涓虹浉鍒 鏁卹=d=16/5 鎵浠ワ紙x-1)^2+(y-1)^2=10.24 cosa=2鈭3/4 a鈭(0,鈭)a=30
绛旓細2x-1锛瀤+2 2x-x锛2+1 x锛3 -x+1锛5 -x锛5-1 -x锛4 x锛-4 x²+x-6锛0 锛坸-2锛夛紙x+3锛夛紲0 -3锛渪锛2 涓▁-3涓ㄢ墹1 -1鈮-3鈮1 -1+3鈮鈮1+3 2鈮鈮4 涓▁-2涓紴1 x-2锛1锛屾垨鑰厁-2锛-1 x锛3锛屾垨鑰咃紝x锛1 ...
绛旓細姹傚疄鏁発鐨勮寖鍥淬1), 璇ヤ簩娆″嚱鏁扮殑瀵圭О杞翠负 x=1, 鎵浠ュ湪鍖洪棿[2,3]涓 鏈夊崟璋冩 鍒嗙被璁ㄨ濡備笅 a>0 鏃讹紝 f(2)=1, f(3)=4 , 瑙ｅ緱 a=1, b=0 a<0鏃讹紝 f(2)=4, f(3)=1 瑙ｅ緱 b=3, 涓嶇鍚堥鎰忥紝鏁 a蹇呯劧澶т簬闆讹紝 a=1, b=0 杩樻湁涓ら锛岃嚜宸辫В鍐充竴涓嬪柦 ...
