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> 2011年雨季,一场大雨导致一条全长为550米的污水排放管道被冲毁,为了尽量减少施工对城市交通所造成的影响,实际施工时,每天的工效比原计划增加10%,结果提前5天完成这一任-八年级数学
2011年雨季,一场大雨导致一条全长为550米的污水排放管道被冲毁,为了尽量减少施工对城市交通所造成的影响,实际施工时,每天的工效比原计划增加10%,结果提前5天完成这一任-八年级数学
题目简介
2011年雨季,一场大雨导致一条全长为550米的污水排放管道被冲毁,为了尽量减少施工对城市交通所造成的影响,实际施工时,每天的工效比原计划增加10%,结果提前5天完成这一任-八年级数学
题目详情
2011年雨季,一场大雨导致一条全长为550米的污水排放管道被冲毁,为了尽量减少施工对城市交通所造成的影响,实际施工时,每天的工效比原计划增加10%,结果提前5天完成这一任务,问原计划每天铺设多少米管道?(列方程解应用题)
题型:解答题
难度:中档
来源:不详
答案
原计划每天铺设10m管道
试题分析:设原计划每天铺设x米管道,根据实际施工时,每天的工效比原计划增加10%,表示出现在每天铺设的米数,根据现在比原计划提前5天,用全长除以每天铺设的米数分别表示出原计划及现在的时间,两时间相减等于5即可列出所求的方程,
-
=5,解方程x=10.
试题解析:设原计划每天铺设xm的管道,则实际每天铺设(1+10%)xm的管道,
由题意列方程:
-
=5,
化简得1.1×550-550=5×1.1x,
x =10,
检验 :当x=10时,1.1x≠0,
∴ x=10是原方程的根,
答:原计划每天铺设10m管道.
上一篇 :
分式方程的根是[]A.x=-2B.x=0C
下一篇 :
(1)化简:a+b5ab•10ab2a2-b2;(2)解分
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题目简介
2011年雨季,一场大雨导致一条全长为550米的污水排放管道被冲毁,为了尽量减少施工对城市交通所造成的影响,实际施工时,每天的工效比原计划增加10%,结果提前5天完成这一任-八年级数学
题目详情
答案
试题分析:设原计划每天铺设x米管道,根据实际施工时,每天的工效比原计划增加10%,表示出现在每天铺设的米数,根据现在比原计划提前5天,用全长除以每天铺设的米数分别表示出原计划及现在的时间,两时间相减等于5即可列出所求的方程,
试题解析:设原计划每天铺设xm的管道,则实际每天铺设(1+10%)xm的管道,
由题意列方程:
化简得1.1×550-550=5×1.1x,
x =10,
检验 :当x=10时,1.1x≠0,
∴ x=10是原方程的根,
答:原计划每天铺设10m管道.