1.设æ»é¿ä¸ºSï¼åç²çé度为S/16,ä¹ä¸ºS/24.
å·²ç¥å·²æåè¡èµ°äº8å°æ¶ï¼åè¿æS-S/24*8=2*S/3çè·¯ç¨è¿æªè¡èµ°ã
å设Tå°æ¶å两人ç¸éï¼ç±é¢æå¯ä»¥å¾åºï¼
T*(S/16+S/24)=2*S/3
T*(S/16)+21.6=T*(S/24)+S/3
å¾åºT=32/5, S=108
æ以ç²çæ¶é为27/4,ä¹çæ¶é为9/2
2.ç±é¢æï¼è®¾ç²çæ¶é为Xï¼ä¹çæ¶é为Yï¼å
¨ç¨ä¸ºS
åï¼S/2+15=56.25
(S/2-15)/X=5.25
å¯ä»¥å¾åºS=82.5,X=5
å 为26.25/Y=56.25/Xï¼æ以Y=2.3
3.设ç²çæ¶é为Xï¼ä¹çæ¶é为Y,2å°æ¶åç¸è·80KM,å继ç»è¡1å°æ¶30åè¿ç¸è·50KMï¼åè¡äºTå°æ¶äºäººç¸é
ï¼2+1.5+Tï¼X=(2+1.5+T)Y+24
XT+YT=50
1.5X+1.5Y=30
å¯å¾T=2.5,X=12,Y=8
4.设å
¨é¿ä¸ºS,设客车è¡é©¶äº1.5å°æ¶ååè¡é©¶äºTå°æ¶
åï¼S=1.5*60+60T
S=52*T+122
å¯ä»¥å¾åºS=330
5.设ä¹åºå5åéååè¡é©¶äºTåé
åï¼120*T+1200=5*100+100*T+1700
æ以 T=50,æ以两å°ç¸è·120*50+1200=7200
6.设å
¨é¿ä¸ºSï¼åç±é¢æå¯å¾
S/42=(36+36+S)/45-7/5
æ以 S=126
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