如图1.两车同时出发相向而行，两车之间的距离y和行驶时间x的关系如图所示，两车出发后（）相遇。 （2分）两辆汽车在同一平直公路上同时出发，其位置x与时间t的...
\u7532\u8f66\u4eceA \u5730\u9a76\u5f80 C\u5730\uff0c\u5728C \u505c\u7559\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u8fd4\u56deA\u5730\uff0c\u4e59\u8f66\u4eceB\u5730\u7ecfC\u5730A\u9a76\u5f80\uff0c\u4e24\u8f66\u540c\u65f6\u51fa\u53d1\uff0c\u76f8\u5411\u800c\u884c\uff0c\u540c\u65f6\uff081\uff09\u7531\u9898\u610f\u53ef\u5f97\uff1aA\u3001B\u4e24\u5730\u4e4b\u95f4\u7684\u8ddd\u79bb\u4e3a960km\uff1b\u7532\u3001\u4e59\u4e24\u8f66\u7684\u901f\u5ea6\u548c\uff1a960\u00f76=160\uff08km/h\uff09\uff0c\u6240\u4ee5\u4e59\u8f66\u7684\u901f\u5ea6\uff1a120\u00f7\uff088-6\uff09=60\uff08km/h\uff09\uff0c\u7532\u8f66\u7684\u901f\u5ea6\uff1a160-60=100\uff08km/h\uff09\uff0e\uff082\uff09\u7532\u8f66\u8ffd\u4e59\u8f66120km\uff0c\u65f6\u95f4\u4e3a120\u00f7\uff08100-60\uff09=3\uff08h\uff09\uff0c\u5219D\u70b9\u6a2a\u5750\u6807\u4e3a8+3=11\uff08h\uff09\uff0e\u6240\u4ee5D\u7684\u5750\u6807\u4e3a\uff0811\uff0c0\uff09\uff0c\u56fe\u4e2d\u70b9D\u7684\u5b9e\u9645\u610f\u4e49\u662f\u4e59\u884c\u9a7611\u5c0f\u65f6\u540e\u88ab\u7532\u8ffd\u4e0a\uff1b\uff083\uff09\u7532\u8f66\u5728\u4e59\u8f66\u884c\u9a7614\u5c0f\u65f6\u65f6\u5373\u56de\u5230A\u5730\uff0c\u6b64\u65f6\u4e24\u8f66\u4e4b\u95f4\u76f8\u8ddd120\u5343\u7c73\uff0c\u518d\u7ecf\u8fc72\u5c0f\u65f6\uff0c\u4e24\u8f66\u4e4b\u95f4\u8ddd\u79bb\u7f29\u5c0f\u81f3\u96f6\uff0c\u5982\u56fe\u6240\u793a\uff1b\uff084\uff09\u5f5311\u2264x\u226416\u65f6\uff0c\u4e24\u8f66\u4e4b\u95f4\u6700\u8fdc\u76f8\u8ddd120\u5343\u7c73\uff0e\u6240\u4ee5\uff0c\u5f5311\u2264x\u226414\u65f6\uff0cy=40x-440 \uff08\u8fc7\uff0811\uff0c0\uff09\u548c\uff0814\uff0c120\uff09\u7684\u7ebf\u6bb5\uff09\uff0e\u5f5314\u2264x\u226416\u65f6\uff0cy=-60x+960 \uff08\u8fc7\uff0814\uff0c120\uff09\u548c\uff0816\uff0c0\uff09\u7684\u7ebf\u6bb5\uff09\uff0e\u6545\u7b54\u6848\u4e3a\uff081\uff09960km\uff1b100\uff0c60\uff1b\uff082\uff09\uff0811\uff0c0\uff09\uff0c\u4e59\u884c\u9a7611\u5c0f\u65f6\u540e\u88ab\u7532\u8ffd\u4e0a\uff0e
30\uff1b450\uff0e \u8bd5\u9898\u5206\u6790\uff1a\u7531\u56fe\u5f97\u51fa\u7532\u4e59\u4e24\u8f66\u90fd\u505a\u5300\u901f\u76f4\u7ebf\u8fd0\u52a8\uff0c\u5728t=50s\u65f6\uff0c\u7532\u8f66\u884c\u9a76\u7684\u8def\u7a0bs \u7532 =1500m\uff0c\u7532\u7684\u901f\u5ea6 \uff1b\u5728t=50s\u65f6\uff0c\u7532\u5904\u57281500m\u7684\u4f4d\u7f6e\uff0c\u4e59\u5904\u57281050m\u7684\u4f4d\u7f6e\uff0c\u4e24\u8f66\u76f8\u8ddd450m\u7684\u8ddd\u79bb\u3002
j解：（1）由图2可知：骑车人从9时出发离开A地，12时到达B地。（由9时时，y=0，12时，y=45千米可得）。(2)由图可知，13时从B地出发，15时到A地，用了2小时。
（3）V=45/（12-9）=15千米/小时。
先求A,B 坐标，再求AB之间的距离。套公式。就可得。
绛旓細j瑙ｏ細锛1锛夌敱鍥2鍙煡锛氶獞杞︿汉浠9鏃鍑哄彂绂诲紑A鍦帮紝12鏃跺埌杈綛鍦般傦紙鐢9鏃舵椂锛寉=0锛12鏃讹紝y=45鍗冪背鍙緱锛夈(2)鐢卞浘鍙煡锛13鏃朵粠B鍦板嚭鍙戯紝15鏃跺埌A鍦帮紝鐢ㄤ簡2灏忔椂銆傦紙3锛塚=45/锛12-9锛=15鍗冪背/灏忔椂銆
绛旓細锛1锛堿銆丅涓ゅ湴鐩歌窛900鍗冪背锛涙晠绛旀涓猴細900锛庯紙2锛夌偣D鐨勫疄闄呮剰涔夛細涓よ溅4灏忔椂鍚庣浉閬囷紱锛3锛塿鎱=900梅12=75km/h锛寁蹇=900梅4-75=150km/h锛宼蹇=900梅150=6h锛孲鎱=75脳6=450km锛屾墍浠ワ紝鐐笶鐨勫潗鏍囦负锛6锛450锛夛紟
绛旓細瑙ｏ細濡傚浘锛绗涓娆＄浉閬囧悗锛屽埌绗簩娆＄浉閬囷紝鐢蹭箼涓よ溅鍏琛2涓崟绋嬶紝鐢茶溅琛岀殑璺▼鏄箼杞︾涓娆＄浉閬囨椂琛岀殑璺▼鐨2鍊嶅80鍗冪背锛岄偅涔堢涓娆＄浉閬囨椂锛岀敳杞︽瘮涔欒溅澶氳80梅2锛40(鍗冪背)鍥犳鍚堣涓涓崟绋嬮渶瑕40梅8锛5灏忔椂锛屽垯鍙畻鍑轰笢瑗夸袱绔欑殑璺濈鏄細40脳5脳2锛40锛360(鍗冪背)绛旓細涓滆タ涓ょ珯鐨勮窛绂绘槸360...
绛旓細AB涓ゅ湴鐩歌窛200鍗冪背銆傜1娆＄浉閬囨椂锛屼袱杞鍏辫鍏ㄧ▼1閬嶏紝杩欐椂鐢杞﹁浜85km銆傚埌绗2娆＄浉閬囨椂锛屼袱杞﹀叡琛屽叏绋3閬嶏紝杩欐椂鐢茶溅鍏辫浜85脳3=255km锛涚浉閬囩偣绂籅55km銆傛墍浠ワ紝AB鍏ㄧ▼=255-55=200km銆傝В绛旂浉閬囬棶棰樼殑娉ㄦ剰浜嬮」锛1銆佽В绛旇繖绫婚棶棰橈紝瑕佸紕娓呴鎰忥紝鎸夌収棰樻剰鐢诲嚭绾挎鍥撅紝鍒嗘瀽鍚勬暟閲忎箣闂寸殑鍏崇郴锛岄夋嫨瑙...
绛旓細瑙:鐢遍鎰忕煡,鐢茶溅鍦ㄥ畞瀹夈佷箼杞﹀湪鍝堝皵婊ㄦ椂(鍗冲紑濮嬫椂)涓よ溅鐩歌窛360km.鍑哄彂2灏忔椂鏃,Y=0,璇存槑涓よ溅鐩搁亣,3灏忔椂鏃,Y鍙樺ぇ,璇存槑涓よ溅鐨勮窛绂诲啀澧炲姞,鑰屾渶鍚嶻骞舵病鏈夎揪鍒360km,鍙槸Y鏈澶ц揪鍒200km.浜嬪疄涓"鐢茶溅杩斿洖鍒颁簡瀹佸畨",鑰屽彸渚х殑鍥捐薄鏄"鐩寸殑绾挎",璇存槑Y鍊煎湪鍖閫熷鍔,鏁呯敳杞︿粠A鍦拌繑鍥炲埌瀹佸畨琛岄┒浜...
绛旓細涔欒溅浠嶣鍒 A鍐嶈繑鍥炲埌D锛岃蛋鐨勮矾绋嬫槸鍏ㄧ▼鐨勶細1锛3梅锛1锛3锛夛紳1锛3/4锛7/4 鐢蹭箼涓よ溅璧扮殑璺▼姣旀槸锛5/4鈭7/4锛5鈭7 鍥犱负閫熷害姣旂瓑浜庤矾绋嬫瘮锛屾墍浠ョ涓娆′袱杞︾浉閬囧湪C鐐规椂锛岀敳杞﹁蛋浜嗗叏绋嬬殑锛堝嵆浠嶢鐐瑰埌C鐐圭殑璺濈鍗犲叏绋嬬殑锛夛細5梅锛5锛7锛夛紳5/12 浠嶢鐐瑰埌D鐐圭殑璺濈鍗犲叏绋嬬殑锛3梅锛1锛...
绛旓細濡傚浘 绗涓娆＄浉閬囨椂锛屼袱杞鍏卞悓璧颁簡涓涓叏绋嬨旂孩銆佽摑瀹炵嚎娈点曪紝杩欐椂鐢茶溅璧颁簡80鍗冪背銆旇摑鑹插疄绾挎銆曪紱鍒扮浜屾鐩搁亣鏃讹紝涓よ溅鍏卞悓璧颁簡涓変釜鍏ㄧ▼锛屾墍浠ョ敳杞﹁蛋浜嗭細80脳3锛240锛堝崈绫筹級鍙堢煡绗簩娆＄浉閬囩B鍦60鍗冪背锛岃嚦姝わ紝鐢茶溅宸茶蛋浜嗕竴涓叏绋嬪姞60鍗冪背锛屾墍浠ュ叏绋嬶細240-60锛180锛堝崈绫筹級...
绛旓細3锛夌敳杞﹀湪涔欒溅琛岄┒14灏忔椂鏃跺嵆鍥炲埌A鍦帮紝姝ゆ椂涓よ溅涔嬮棿鐩歌窛120鍗冪背锛屽啀缁忚繃2灏忔椂锛屼袱杞涔嬮棿璺濈缂╁皬鑷抽浂锛屽鍥鎵绀猴紱锛4锛夊綋11鈮鈮16鏃讹紝涓よ溅涔嬮棿鏈杩滅浉璺120鍗冪背锛庢墍浠ワ紝褰11鈮鈮14鏃讹紝y=40x-440 锛堣繃锛11锛0锛夊拰锛14锛120锛夌殑绾挎锛夛紟褰14鈮鈮16鏃讹紝y=-60x+960 锛堣繃锛14锛120锛...
绛旓細绗涓娆＄浉閬囨椂锛屼袱杞琛岄┒鐨勮矾绋嬪拰绛変簬AB涓ゅ湴璺濈锛岀敳杞﹁椹剁殑AC绛変簬32鍗冪背 涔欒溅浠庣涓娆＄浉閬囧埌绗簩娆＄浉閬囪椹剁殑璺▼鏄疌A锛婣D锛32锛64锛96锛堝崈绫筹級浠庡浘涓彲鐪嬪嚭锛屼袱杞﹀湪C鐐圭浉閬囧悗锛屽張琛岄┒鍒癉鐐圭浜屾鐩搁亣鏃讹紝涓よ溅琛岄┒鐨勮矾绋嬪拰绛変簬AB涓ゅ湴璺濈鐨2鍊嶏紝鍗充袱杞﹁椹剁殑璺▼鍒嗗埆鏄涓娆＄浉閬囨椂琛岄┒璺▼...
绛旓細鍑哄彂鏃,瀹㈣溅銆佽揣杞︾殑閫熷害姣旀槸 6鈭5 ,鍒欑浉閬囨椂瀹㈣溅琛屼簡鍏ㄧ▼鐨 6/(6+5) = 6/11 锛涚浉閬囧悗,瀹㈣溅銆佽揣杞︾殑閫熷害姣斿彉涓 [6脳(1-20%)]鈭禰5脳(1+20%)] = 4鈭5 ,鐩搁亣鍚庤揣杞﹁繕闇瑕佽鍏ㄧ▼鐨 6/11 鍒拌揪鐢插湴,鍚屾牱鏃堕棿鍐呭杞﹁浜嗗叏绋嬬殑 (6/11)脳(4/5) = 24/55 锛涘凡鐭,褰撹揣杞﹀埌杈剧敳鍦...
