2．(2008山东济南)解方程：2(x－1)+1=0.

解：2x－2+1=0……1分

2x=1……1分

X=……3分

17. 解(1)设2007职业中专的在校生为x 万 人　　　　　　　　　　 　　

根据题意得：1500×1.2x －1500x ＝600　　　　 ··························································· 3分

解得：　　　　　　　　　　　　　　　　　　　 ················································ 5分

所以．

　····························································································· 7分

答：略．　　　　　　　　　　　　　　　　　　　　　 ············································································· 8分

16.

解：方案一获利：4×2000+6×500=11000(元)

方案二：设制奶粉x天，则

1×x+(4-x)×3=10，

得x=1(天)

故1×1×2000+3×3×1200=12800(元)

选方案二.

15. 解:设老师捐款x元,学生捐款y元.则有

解得

　　　　 答:该校老师捐款18000元,学生捐款27000元.

14. 解：(1)设每条成衣生产线和童装生产线平均每天生产帐篷各x、y顶，则

，

解得x=41，y=32．

答：每条成衣生产线平均每天生产帐篷41顶，每条童装生产线平均每天生产帐篷32顶．

(2)由3(4×41+5×32)=972＜1000知，即使工厂满负荷全面转产，还不能如期完成任务．

可以从加班生产、改进技术等方面进一步挖掘生产潜力，或者动员其它厂家支援等，想法尽早完成生产任务，为灾区人民多做贡献．

13. 解：设原计划每天挖土石方x万立方米，增调人员和设备后每天挖y万立方米

　　　 可列出方程组：

　　　 解之得：

　 答：原计划每天挖土石方1.3万立方米，增调人员和设备后每天挖3.6万立方米

12. 解：(1)设总厂原来每周制作帐篷千顶，分厂原来每周制作帐篷千顶．

由题意，得························································································ 3分

解得所以(千顶)，(千顶)．

答：在赶制帐篷的一周内，总厂、分厂各生产帐篷8千顶、6千顶．································ 6分

(2)设从(甲市)总厂调配千顶帐篷到灾区的地，则总厂调配到灾区地的帐篷为千顶，(乙市)分厂调配到灾区两地的帐篷分别为千顶．

甲、乙两市所需运送帐篷的车辆总数为辆．································································ 8分

由题意，得．

即．······················································································· 10分

因为，所以随的增大而减小．

所以，当时，有最小值60．

答：从总厂运送到灾区地帐篷8千顶，从分厂运送到灾区两地帐篷分别为1千顶、5千顶时所用车辆最少，最少的车辆为60辆．　　　 12分

11. 解：设生产奥运会标志x套，生产奥运会吉祥物y套．根据题意，得

　 …………………………………………2分

①×2－②得：5x=10000．　

∴ x=2000． ………………………………………………………………6分

把x=2000代入①得：5y=12000．

　　　　 ∴ y=2400． 　

　　 答：该厂能生产奥运会标志2000套，生产奥运会吉祥物2400套．……8分

10. (1)甲队行进了2小时，乙队行进了2.5小时．

设乙队的速度为x，则甲队为1.5x + 5．

由题意得方程　 2.5x +(1.5x + 5)×2 + 1 = 176．

整理得 5.5x = 165， 解得 x = 30．

∴　 1.5x + 5 = 1.5×30 + 5 = 50．

即甲队赶路的速度为50 km∕h，乙队赶路的速度为30 km∕h．

(2)设若由乙队单独施工，需x小时才能完成．

则由题意有 　6×()+ 5.5×= 1．

解得　 x = 11．

即乙队单独做，需要11小时才能完成任务．

9. 解：(1)设小明他们一共了个成人，个学生，

·································································································· 4分

······················································································································ 6分

答：小明他们一共去了7个成人，4个学生．··································································· 7分

(2)若按14人购买团体票，则共需(元)

(元)．

购买团体票可省24元．······························································································· 3分