奥数题:当王明在100m赛跑冲到终点时,领先刘铭10m
- 时间:2020-06-09 15:19:31
- 分类:数学世界
- 阅读:153 次
数学题:当王明在100m赛跑冲到终点时,领先刘铭10m,领先李亮15m。当刘明冲到终点时,李亮还差多少冲到终点?(用比例解)
数学题解答:这题要求用比例知识解,所以先要弄清楚三人跑步速度之间的关系。在相同的时间内,王明跑完100米赛跑的全程,即100m,而此时刘铭跑了100-10=90(米),李亮跑了100-15=85(米)。
由于所用的时间相同,所以刘铭与李亮的速度比,就是他们所跑的路程的比,即90:85。
设刘明跑完全程时,李亮跑了x米。则有:
100:x=90:85
90x=100×85
x=100×85÷90
x=94又九分之四
李亮离终点还差:100 – 94又九分之四=5又九分之五(米)
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