广东省茂名市信宜市七年级数学上册第五章一元一次方程5.5应用一元一次方程—追赶小明同步作业(无答案)(新版)北师大版.doc

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155 应用一元一次方程-追赶小明班别 姓名 基础题:1、甲乙两人练习赛跑,甲每秒钟跑 7m,乙每秒钟 6.5m。他们从 同一地点起跑,乙先跑 5m后,甲再出发追赶乙。设甲出发 x 秒后追上乙,则下列四个方程中正确的是( )A、7x=6.5x+5 B、7x=6.5x-5 C、7x+5=6.5x D、(7+6.5)x=52、一列长 am 的队 伍以 60m/min 的速度向前行进,队尾一名同学用 1min 从队尾 走到队头,这位同学走的路程是( )A、am B、(a+60)m C、60am D、(60+2a)m3、解方程:(1)( x+1)-2(x -1)=1-3x (2) 30564x提高题:甲,乙两人在 400m 长的环形跑道上跑步,甲每分钟 跑 240m,乙每分钟跑 200m,若二人同时同地同向出发,则几分钟后相遇?若背向跑,几分钟后相遇?

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