数学ir题求解

Aimee_728 · 发表于 2015-12-6 12:30:11

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If Bob produces 36 or fewer items in a week, he is paid x dollars per item. If Bob produces more than 36 items in a week,he is paid x dollars per item for the first 36 items and 1.5 times that amount for each additional item. How many items didBob produce last week?
[size=9.000000pt](1) Last week Bob was paid a total of $480 for the items that he produced that week.
[size=9.000000pt](2) This week Bob produced 2 items more than last week and was paid a total of $510 for the items that he produced thisweek.
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根据（1）（2）两个条件我列出的式子是设x是单价，y是数量
36x＋1.5X（y－36）＝480；36x＋1.5X（y＋2-36）＝510，是可以计算出x和y的，但是答案是e，请问我哪里理解错了呢？

数学ir题求解

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