设x秒后甲追上乙,根据等量关系:甲x秒所跑的路程=乙x秒所跑的路程+乙1秒所跑的路程.
列方程得:7x=6.5(x+1),
解得:x=13,
答:甲经过13秒可以追上乙.
甲、乙两人练习100米赛跑,甲每秒跑7米,乙每秒跑6.5米,如果甲让乙先跑1秒,那么甲经过几秒可以追上乙?
甲、乙两人练习100米赛跑,甲每秒跑7米,乙每秒跑6.5米,如果甲让乙先跑1秒,那么甲经过几秒可以追上乙?
数学人气:805 ℃时间:2020-03-29 18:05:11
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