问到数学题。

samobojcow · 发表于 2015-7-14 10:00:10

An equal number of desks and bookcases are to be placed along a library wall that is 15 meters long. Each desk is 2 meters long, and each bookshelf is 1.5 meters long. If the maximum possible number of desks and bookcases are to be placed along the wall, then the space along the wall that is left over will be how many meters long?

答案是1 方程我懂 2x+1.5y+z=15 但为什么代入 x=2 y＝8 这样不是已经16了么怎么放得下？

larochelle · 发表于 2015-7-14 10:20:00

大概忘了注意根据题目是equal number of desks and bookcases吧，所以你方程就变成3.5x+z=15,x为整数，所以最大可能的x是4，
剩下的部分为1啊。

samobojcow · 发表于 2015-7-14 10:29:52

larochelle 发表于 2015-7-14 10:20
大概忘了注意根据题目是equal number of desks and bookcases吧，所以你方程就变成3.5x+z=15,x为整数，所 ...

谢谢！！！

问到数学题。

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