鍒濅腑鏁板锛屽嚱鏁板帇杞撮锛屾渶鍊间笌瀛樺湪鎬ч棶棰樺浣曠獊鐮达紵

来源：yabo2018 编辑：U体育所属栏目：亚博体育时间：2019-02-03 06:30:29

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杞浇鑷櫨瀹跺彿浣滆€咃細鍛ㄨ€佸笀鏁板璇惧爞

澶у濂斤紝娆㈣繋璧拌繘鍛ㄨ€佸笀鏁板璇惧爞锛屾瘡澶╄繘姝ヤ竴鐐圭偣锛屽潥鎸佸甫鏉ュぇ鏀瑰彉銆備粖澶╂槸2019骞?鏈?4鏃ワ紝鍒嗕韩鐨勫唴瀹规槸浜屾鍑芥暟鍑犱綍缁煎悎棰樸€?span class="bjh-br">

鐪熼姹傝В

濡傚浘锛岀洿绾縴=-3x+3涓巟杞淬€亂杞村垎鍒氦浜嶢锛孊涓ょ偣锛屾姏鐗╃嚎y=-x*2+bx+c涓庣洿绾縴=c鍒嗗埆浜杞寸殑姝ｅ崐杞翠簬鐐笴鍜岀涓€璞￠檺鐨勭偣P锛岃繛鎺B锛屽緱鈻砅CB鈮屸柍BOA(O涓哄潗鏍囧師鐐?銆傝嫢鎶涚墿绾夸笌x杞存鍗婅酱浜ょ偣涓虹偣F锛岃M鏄偣C锛孎闂存姏鐗╃嚎涓婄殑涓€鐐?鍖呮嫭绔偣)锛屽叾妯潗鏍囦负m.

鈶?鐩存帴鍐欏嚭鐐筆鐨勫潗鏍囧拰鎶涚墿绾跨殑瑙ｆ瀽寮忥紱

鈶?褰搈涓轰綍鍊兼椂锛屸柍MAB闈㈢НS鍙栧緱鏈€灏忓€煎拰鏈€澶у€?锛?璇疯鏄庣悊鐢憋紱

鈶? 姹傛弧瓒斥垹MPO=鈭燩OA鐨勭偣M鐨勫潗鏍囥€?/span>

瑙ｉ姝ラ

瑙ｏ細鈶村綋y=c鏃讹紝鏈塩=-x*2+bx+c锛?span class="bjh-br">瑙ｅ緱锛歑1=0锛孹2=b锛?span class="bjh-br">鈭寸偣C鐨勫潗鏍囦负(0锛宑)锛岀偣P鐨勫潗鏍囦负(b锛宑)锛?span class="bjh-br">鈭电洿绾縴=-3x+3涓巟杞淬€亂杞村垎鍒氦浜嶢銆丅涓ょ偣锛?span class="bjh-br">鈭寸偣A鐨勫潗鏍囦负(1锛?)锛岀偣B鐨勫潗鏍囦负(0锛?)锛?span class="bjh-br">鈭碠B=3锛孫A=1锛孊C=c-3锛孋P=b.鈭碘柍PCB鈮屸柍BOA锛?span class="bjh-br">鈭碆C=OA锛孋P=OB锛?span class="bjh-br">鈭碽=3锛宑=4锛?span class="bjh-br">鈭寸偣P鐨勫潗鏍囦负(3锛?)锛屾姏鐗╃嚎鐨勮В鏋愬紡涓?span class="bjh-br">y=-x*2+3x+4.

鈶?褰搚=0鏃讹紝鏈?x*2+3x+4=0锛?span class="bjh-br">瑙ｅ緱锛歑1=-1锛孹2=4锛?span class="bjh-br">鈭寸偣F鐨勫潗鏍囦负(4锛?)锛?span class="bjh-br">杩囩偣M浣淢E鈭杞达紝浜ょ洿绾緼B浜庣偣E锛屽鍥?span class="bjh-br">1鎵€绀?

鈶?鈶犲綋鐐筂鍦ㄧ嚎娈礝P涓婃柟鏃讹紝鈭礐P鈭杞达紝鈭村綋鐐笴銆丮閲嶅悎鏃讹紝鈭燤PO=鈭燩OA锛?span class="bjh-br">鈭寸偣M鐨勫潗鏍囦负(0锛?)锛?/span>

鈶″綋鐐筂鍦ㄧ嚎娈礝P涓嬫柟鏃讹紝鍦▁姝ｅ崐杞村彇鐐?span class="bjh-br">D锛岃繛鎺P锛屼娇寰桪O=DP锛屾鈭燚PO=鈭燩OA锛?span class="bjh-br">璁剧偣D鐨勫潗鏍囦负(n锛?锛夛紝鍒橠O=n锛?span class="bjh-br">DP=鈭?n-3)*2+(0-4)*2鈭磏*2=(n-3)*2+16.瑙ｅ緱锛歯=25/6鈭寸偣D鐨勫潗鏍囦负(25/6锛?)锛?span class="bjh-br">璁剧洿绾縋D鐨勮В鏋愬紡涓簓=kx+a(k鈮?)锛?span class="bjh-br">灏哖(3锛?)銆丏(25/6锛?)浠ｅ叆y=kx+a锛?span class="bjh-br">3k+a=4锛?5/6k+a=0锛?span class="bjh-br">瑙ｅ緱 k=-24/7锛宎=100/7.鈭寸洿绾縋D鐨勮В鏋愬紡涓簓=-24/7x+100/7.鑱旂珛鐩寸嚎PD鍙婃姏鐗╃嚎鐨勮В鏋愬紡鎴愭柟绋嬬粍锛?span class="bjh-br">y=24/7x+100/7锛寉=-x*2+3x+4锛?span class="bjh-br">瑙ｅ緱锛氣吂1=3锛寉1=4锛泋2=24/7锛寉2=124/49.鈭寸偣M鐨勫潗鏍囦负(24/7锛?24/49)缁间笂鎵€杩帮細婊¤冻鈭燤PO=鈭燩OA鐨勭偣M鐨勫潗鏍囦负(0锛?)鎴?24/7锛?24/49).

瑙ｉ鎬荤粨

涓婇鏄竴閬撳嚱鏁板嚑浣曠患鍚堥锛岃€冪偣锛?涓€娆″嚱鏁帮紝浜屾鍑芥暟锛屼竴鍏冧簩娆℃柟绋嬪強鏂圭▼缁勶紝鍏ㄧ瓑涓夎褰㈡€ц川锛屾渶鍊奸棶棰橈紝瀛樺湪鎬ч棶棰樸€傚嚱鏁扮殑鏈€鍊煎拰瀛樺湪鎬ч棶棰橈紝鏄繎鍑犲勾涓€冪儹鐐归鍨嬶紝鍚屽浠湪瑙ｉ鏃舵€濊矾瑕佹竻鏅帮紝绗竴闂€氬父鏄繍鐢ㄥ緟瀹氱郴鏁版硶缁撳悎鏂圭▼鎬濇兂姹傚嚭瑙ｆ瀽寮忥紝鏍规嵁鍥捐薄鎬ц川缁撳悎棰樺共闂姹傚嚭鏈€鍊硷紝閫氬父鏄繍鐢ㄩ厤鏂规硶姹傛渶鍊硷紝鍦ㄦ眰瀛樺湪鎬ч棶棰樻椂闇€瑕佸垎绫昏璁烘眰鍑虹粨鏋滐紝涓€瀹氳娉ㄦ剰涓嶈婕忛」锛岄潪甯稿叧閿紝鍚屽浠彲浠ョ湅鐪嬭В棰樻楠わ紝瀵逛綘鐞嗛『鎬濊矾锛屽浼氳В棰樻柟娉曚細鏈夊府鍔╋紝浣犺涓哄憿锛?span class="bjh-br">

浠婂ぉ鐨勫垎浜氨鍒拌繖閲岋紝娆㈣繋澶у鍦ㄨ瘎璁哄尯鐣欎笅鎮ㄧ殑鎬濊矾锛岃鎴戜滑鍏卞悓璁ㄨ锛屼篃璁告偍鐨勬€濊矾鏄渶妫掔殑銆傚枩娆㈡枃绔犺寰楀垎浜摝锛?/span>

娉細鍥剧墖鏉ユ簮浜庣綉缁滐紝濡傛湁渚垫潈锛岃鑱旂郴鍒犻櫎銆?/span>

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