标题: for help!! [打印本页] 作者: drlucky 时间: 2003-1-11 21:00 标题: for help!!
The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?
我得不到结果，请指点！！！！作者: lisaislisa 时间: 2003-1-11 21:26
y(1-x%)+8Y
^^
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