On my car, a particular brand of tyre lasts 40,000 km on a front wheel or 60,000 km on a rear
wheel. by interchanging the front and the rear wheels, what is the greatest distance that I can
get from a set of four of these types?
求助解题方法。
评论
谢谢你,可是我孩子老师给的正确答案是48000km。
评论
should be still 40000km, it was 40000km as the greatest distance previously, interchanging doesn't affect anything, so it can now still only last for 40000km.
评论
4,8000是对的
跑了X公里以后交换轮胎,剩下的公里数相同
(40000-X)×3/2=(60000-X)*2/3
X=24000
剩下的也是24000
5万公里是不可能的,你不可能把两个轮胎保存起来等其他两个轮胎跑到一定公里
评论
请问楼主这是几年级的题
评论
是七年级的数学题。
评论
谢谢, 我明白了。
评论
难
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