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标题: 求助一道PREP数学 [打印本页]

作者: chamcham 时间: 2010-12-13 20:00 标题: 求助一道PREP数学

Alice's take-home pay last year was the same each month,and she saved the same fraction of her take-home pay each month.The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save.If all the money that she saved last year was____?
答案是五分之一...题目看似简单但完全不知道怎么出来答案的=.=

作者: sumerlaws 时间: 2010-12-14 06:37

设save了x, 方程12x=3(1-x),假设每个月挣1，则解x=1/5，除以1还是1/5

作者: tingting520 时间: 2010-12-15 06:42

题目最后一句是不是有问题？

作者: chamcham 时间: 2010-12-15 21:05

谢谢! 我题意弄错了。。

作者: natalietong 时间: 2010-12-16 21:07

2楼同鞋的方法简单...
我傻傻的还设了1/a为所用的份数...

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