高三函数题一道求教
[\u9ad8\u4e09]\u4e00\u9053\u51fd\u6570\u9898\u6c42\u52a9\u7b2c\u4e09\u95ee\uff1a
q\u2018(x\uff09=-3x2+2kx+5\uff08x\u22640\uff09
q\u2018(x\uff09=-1/x+k\uff08x>0\uff09
q\u2018(x\uff09\u9996\u5148\u770bx>0\u7684\u65f6\u5019,\u662f\u4e2a\u9012\u589e\u51fd\u6570,\u503c\u57df\u4e3a(-\u221e,k)
\u518d\u770bq\u2018(x\uff09,x>0\u65f6,\u6839\u636e\u8981\u6c42k\u662f\u6b63\u5b9e\u6570,\u90a3\u4e48\u5bf9\u79f0\u8f74x=k/3\u662f\u5927\u4e8e0\u7684
\u90a3\u4e48\u5728x\u22640\u7684\u65f6\u5019q\u2018(x\uff09\u662f\u5355\u8c03\u9012\u589e\u7684\uff0c\u90a3\u6839\u636e\u9898\u610f\uff0c\u53ea\u8981\u4f7f\u5f97\u6700\u4e0a\u9762\u4e24\u4e2a\u51fd\u6570\u7684\u503c\u57df\u76f8\u7b49\u5373\u53ef
\u6240\u4ee5\u5bf9\u4e8e\u7b2c\u4e00\u4e2a\u51fd\u6570\u800c\u8a00\uff0c\u6700\u5927\u503cq\u2018(0)=0+0+5=5=k\uff0c\u6240\u4ee5k=5
\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u56e0\u4e3a\u5728x=0\u8fd9\u4e00\u70b9\u51fd\u6570f(x)\u4e0d\u8fde\u7eed\uff0c\u6545\u800c\u4e0d\u53ef\u5bfc\uff0c\u6240\u4ee5\u7b2c\u4e00\u4e2a\u5bfc\u51fd\u65705\u662f\u53d6\u4e0d\u5230\u7684\uff0c\u6240\u4ee5\u624d\u80fd\u4fdd\u8bc1\u4e24\u4e2a\u5bfc\u51fd\u6570\u503c\u57df\u76f8\u540c\uff0c\u6240\u4ee5\u6700\u7ec8k=5
\u89e3\uff1a
\u66f2\u7ebfC\u53ca\u5176\u5bf9\u79f0\u8f74l.\u53c2\u9605\u56fe4.
看不清楚，我把答案发上来
答案如图所示，友情提示：点击图片可查看大图
答题不易，且回且珍惜
如有不懂请追问，若明白请及时采纳，祝学业有成O(∩_∩)O~~~
绛旓細濡傛灉鎶婂緞鍚戝拰娉曞悜鐨勮繍鍔ㄦ柟绋嬮兘鍒楀嚭鏉ワ紝 闇瑕佽В涓涓畝鍗曠殑寰垎鏂圭▼锛 杩欏凡缁忚繙杩滆秴鍑轰簡楂樹腑鐗╃悊鐨勮寖鐣达紝 鍗充娇绠楀嚭N锛坱heta锛夛紝 鍗砃闅忚搴﹀彉鍖栫殑鍑芥暟锛 涔熶笉瀹规槗鐪嬪嚭N鐨勫钩鍧囧兼槸鍚﹀ぇ浜巑g銆 鎴戦潪甯镐箰鎰忕湅鍒版湁浜鸿兘鐢ㄩ珮涓墿鐞嗙殑鏂规硶鏉ヨВ鍐宠繖涓棶棰樸 浣嗘槸鑰冭檻鍐嶄笁锛 娌℃湁鎯冲嚭鏈変粈涔堢畝鍗曠殑鏂规硶鏉ヨВ鍐冲畠銆
绛旓細鈭磃锛坸锛夌殑鍊煎煙鏄蓟锛堚垰3锛1锛/2锛屸垰2锛姐傛敞锛氫笅闈㈡眰sin锛埾/12锛夌殑鍊笺俿in锛埾/12锛夛紳sin锛埾/3锛嵪/4锛夛紳sin锛埾/3锛塩os锛埾/4锛夛紞cos锛埾/3锛塻in锛埾/4锛夛紳锛堚垰3/2锛壝楋紙鈭2/2锛夛紞锛1/2锛壝楋紙鈭2/2锛夛紳锛堚垰6锛嶁垰2锛/4銆傝ˉ鍏呰鏄庯細鈭垫寮鍑芥暟y锛漵inx鍦ㄧ涓璞￠檺涓婃槸澧...
绛旓細sou
绛旓細鍥炵瓟锛氳櫧鐒棰樼洰娌℃湁缁欏嚭鏉,浣嗘垜鐭ラ亾鍑芥暟褰㈠紡涓瀹氭槸 y^2+2my-4m=0 鏍规嵁涓鍏冧簩娆℃柟绋嬫眰瑙ｇ殑闊﹁揪瀹氱悊鍙互寰楀埌 y1+y2=-2m y1y2=-4m 璇佹槑: 璇ヤ竴鍏冧簩娆℃柟绋嬪彲浠ュ啓鎴 (y-y1)(y-y2)=0 灞曞紑寰楀埌y^2-(y1+y2)+y1y2=0 鏄剧劧鍏朵笌y^2+2mx-4m=0绛変环鐨 浜庢槸寰楀埌 -(y1+y2)=2m y1+y2=-2...
绛旓細😊
绛旓細楂樹腑鏁板鍚堥泦鐧惧害缃戠洏涓嬭浇 閾炬帴锛歨ttps://pan.baidu.com/s/1znmI8mJTas01m1m03zCRfQ ?pwd=1234 鎻愬彇鐮侊細1234 绠浠嬶細楂樹腑鏁板浼樿川璧勬枡涓嬭浇锛屽寘鎷細璇曢璇曞嵎銆佽浠躲佹暀鏉愩佽棰戙佸悇澶у悕甯堢綉鏍″悎闆嗐
绛旓細x+y<1涔熷氨浠ｈ〃浜0<x+y<1銆傚洜涓烘婚暱鏄1锛岄偅涔堜袱杈逛箣鍜屼竴瀹氬皬浜庝竴锛屾棦鐒舵槸涓夎褰㈤偅涔堜袱杈逛箣鍜屽ぇ浜0鏄竴瀹氱殑锛屽啓涓嶅啓閮借銆傚洖瀛︽牎闂棶浣犱滑鑰佸笀姣旇緝淇濋櫓锛楂樿姝ラ寰堜弗鐨勩
绛旓細r绾︿负1娆у锛岃繙杩滃皬浜3鍗冩濮嗭紝杩欐牱鍙互蹇界暐浜嗭紝杩欎篃鏄洜涓烘祴閲忔椂娌℃湁杩欎箞楂樼殑绮惧害锛堣揪鍒0.03%锛夛紱鍙﹀r鏄湭鐭ラ噺锛岀粨鏋滀腑褰撶劧涓嶅厑璁稿嚭鐜般傝繕鏈夌粨鏋滃ソ鍍忔槸鍐欏弽浜嗭紝搴旇鏄痥/b鐨勩傚鏋滆繕鏄笉鎳傚彲浠ヨ刀蹇棶鎴戠殑銆
绛旓細OA=a,FA=b,OF=c,she OB=x,AB=genhao(x^2-a^2),FB=AB-b,OA+OB=2AB锛岃В鍑簒= 浠ｅ叆OA/OB=FA/FB锛宎bc鐨勫叧绯
绛旓細涓汉鎰熻閭ｄ釜鍙傛暟鏂圭▼涓嶅銆傜涓锛棰樼洰璇 t 涓哄弬鏁帮紝鍙槸鏂圭▼涓病鏈 t 锛涚浜岋紝鍗充娇鏄 胃 涓哄弬鏁颁粛涓嶅銆傚洜涓 |cos胃|<=1 锛屽洜姝 -4<=x<=2 锛-2<=y<=6 锛岃繖璇存槑閭ｄ釜鍙傛暟鏂圭▼鏄嚎娈佃屼笉鏄洿绾 銆傝矊浼艰繃 P 鐨勭洿绾跨殑鍙傛暟鏂圭▼鏄 锝泋 = -1+3t 锛寉=2-4t 锛坱 涓哄弬鏁帮級銆傚寲涓烘櫘閫...
