甲乙丙三人,速度分别是60米/分,75米/分,80米/分
\u6709\u7532\u3001\u4e59\u4e19\u4e09\u4eba\u6b65\u7684\u901f\u5ea6\u5206\u522b\u662f100\u7c73\u6bcf\u5206\u949f\u300180\u7c73\u6bcf\u5206\u949f\u300175\u7c73\u6bcf\u5206\u949f\uff0c\u73b0\u5728\u7b54\uff1a\u8bbe\u7532\u3001\u4e59\u76f8\u9047\u65f6\u95f4\u4e3aX\u5206\u949f\uff0c\u7532\u3001\u4e19\u76f8\u9047\u65f6\u95f4\u4e3aY\u5206\u949f\uff0c
\u5219100X+80X=100Y+75Y\uff0cY=X+6\uff0c\u6c42\u5f97X=210
\u5f97\u5230\u4e24\u6751\u8ddd\u79bb\u4e3a100X+80X=180*210=37800\u7c73
\u767e\u5ea6\u4e00\u4e0b
\u7f51\u4e0a\u6709\u7b54\u6848
\u7532\u3001\u4e59\u76f8\u9047\u540e4\u5206\u949f\u4e59\u3001\u4e19\u76f8\u9047\uff1b\u8bf4\u660e\u7532,\u4e59\u76f8\u9047\u65f6\u4e59\u3001\u4e19\u8fd8\u5dee4\u5206\u949f\u7684\u8def\u7a0b,
\u5373\u8fd8\u5dee4\u00d7\uff0875+60)=540\u7c73;
\u800c\u8fd9540\u7c73\u4e5f\u662f\u7532,\u4e59\u76f8\u9047\u65f6\u95f4\u91cc\u7532,\u4e19\u7684\u8def\u7a0b\u5dee,
\u6240\u4ee5\u7532,\u4e59\u76f8\u9047=540\u00f7\uff0890-60)=18\u5206\u949f,
\u6240\u4ee5\u8fd9\u6761\u957f\u8857\u7684\u957f\u5ea6=18\u00d7\uff0890+75)=2970\u7c73.
(60+80)x12÷(75-60)
=1680÷15
=112
两地相距:
112x(75+80)=17360
(75+80)t=(60+80)(t+12)
t=112
(75+80)*12=17360
绛旓細(60+80)x12梅(75-60)=1680梅15 =112 涓ゅ湴鐩歌窛锛112x(75+80)=17360
绛旓細X/(60+100)-X/(80+100)=2 X/160-X/180=2 X/720=2 X=1440 AB涓ゅ湴闂寸殑璺濈涓1440绫
绛旓細x=(60+100)*[2+x/(80+100)]x=2880
绛旓細s=11520绫
绛旓細5130 鍦ㄢ滀笝閬囦箼鍚2鍒嗛挓鍙堥亣鐢测濊繖娈垫椂闂村唴涓欎箼鐩稿悜鍏辫蛋270绫筹紝璇存槑鈥滀笝閬囦箼鈥濇椂鐢蹭箼鐩歌窛270绫筹紝璇存槑鈥滀笝閬囦箼鈥濇椂璧颁簡35鍒嗛挓锛270梅锛67.5-60锛=35锛夋墍浠ョ浉璺5130绫筹紙35脳锛67.5+75锛=5130)
绛旓細璺▼涓400绫炽傝璺▼涓簒锛屽垯鏈夛細x/(100-60)+10=x/(100-80)x/40+10=x/20 x+400=2x x=400 瑙f柟绋嬬殑娉ㄦ剰浜嬮」 1銆佹湁鍒嗘瘝鍏堝幓鍒嗘瘝銆2銆佹湁鎷彿灏卞幓鎷彿銆3銆侀渶瑕佺Щ椤瑰氨杩涜绉婚」銆4銆佸悎骞跺悓绫婚」銆5銆佺郴鏁板寲涓1姹傚緱鏈煡鏁扮殑鍊笺6銆佸紑澶磋鍐欌滆В鈥濄
绛旓細璁捐矾绋嬩负x x=(60+100)*[2+x/(80+100)]x=2880
绛旓細鐢蹭箼鐩搁亣鏃,鐢茶蛋浜嗗叏绋嬬殑:60梅(60+50)=6/11 鐢涓鐩搁亣鏃,鐢茶蛋浜嗗叏绋嬬殑:60梅(60+40)=6/10 鍦ㄤ笌涔欑浉閬囧啀鍒颁笌涓欑浉閬,鐢茶蛋浜嗗叏绋嬬殑:6/10-6/11=3/55 杩欐璺▼闀:60梅15=900绫 AB涓ゅ湴璺濈涓:900梅3/55=16500(绫)
绛旓細璁続,B涓ゅ湴鐨勮窛绂讳负x 寰楁柟绋嬶細x梅锛60+100锛-x梅锛80+100锛=2 瑙e緱锛歺=2880 鎵浠,B涓ゅ湴鐨勮窛绂绘槸2880绫 x梅锛60+100锛夋槸锛氱敳锛屼笝涓や汉鐩搁亣鐨勬椂闂 x梅锛80+100锛夋槸锛氫箼锛屼笝涓や汉鐩搁亣鐨勬椂闂
绛旓細銆愭牴鎹箼銆涓鐨閫熷害姣斾负瀹氬煎垪鏂圭▼銆戣涔欏埌杈剧粓鐐规椂涓欒窇浜唜绫筹紝鍒欙細50:45=60锛歺 鍒50x=45脳60 瑙e緱x=54锛堢背锛夊垯涓欑缁堢偣鐨勮窛绂讳负锛60-54=6锛堢背锛