受5.12汶川大地震影响,某地架设在山顶的电视信号发射塔出现故障.为尽快恢复正常的电视节目播放,上午

求的是原计划的工效,工作总量为4800,一定是根据工作时间来列等量关系,本题的关键描述语是：提前2小时完成任务,等量关系为：原计划时间=实际时间+2
设原计划每小时抢修的路线长为xm,
根据题意,得 4800/x=[ 4800/ x(1+20%) ] +2
解之得x=400 （7分）
检验：x=400是原方程的解,且符合题的实际意义．
答：原计划每小时抢修的路线长为400m．
第2题题目不全 应该是：
一项工程需在规定日期完成,如果甲队独做,就要超规定日期1天,如果乙队单独做,要超过规定日期4天,现在由甲、乙两队各做3天,剩下工程由乙队单独做,刚好在规定日期完成,则规定日期为?
分析：
首先设工作总量为1,未知的规定日期为x．则甲单独做需x+1天,乙队需x+4天．由工作总量=工作时间×工作效率这个公式列方程易求解．
设设工作总量为1,规定日期为x天,则若单独做,甲队需x+1天,乙队需x+4天,根据题意列方程得
3[ 1/(x+4)+ 1/(x+1）]+ (x-3)/(x+4)=1,
解方程可得x=8,
经检验x=8是分式方程的解,

I'm living in sichuang province .In 2008,the earthquake take place in wenchuang,this year is the 4th year after it !
Wenchuan is small ,but she is very beautiful .we are all hurted when the earthquake take place ,just a minute ,we loose more than 200 thousand friends .it is living in our head deeply ,and we couldn't forget it !
today ,it is more beautiful than yesterday .because all the chinese people and the friends all over the world are cares !at here ,we must send our thanks words to them ,best wishes for all the people helped us ,and at the same time ,we should send the best wishes for the people in sichuang,wish them living better and better !

asdddfft6yu7u