急求解答一个数学问题~非常非常急

安小安 · 发表于 2010-5-26 22:00:53

Linda put an amount of money into each of two new investments, A and B, that pay simple annual interest. If the annual interest rate of investment B is 1 1/2 times that of investment A, what amount did Linda put into investment A

1. The interest for 1 year is $50 for investment A and $150 for investment B
2. The amount that Linda put into investment B is twice the amount that she put into investment A
为什么是E呀？我觉得是C啊.大家帮忙解释解释吧~

mikiluang · 发表于 2010-5-26 22:06:36

你把2那个条件代回去A，设INVESTMENTA为A， B的INVESTMENT就是2A
RATE是x
Ax/2A(3/2x)=50/150
A就消掉了..
所以还是求不出来的

呵呵应该是这样吧

小货舱 · 发表于 2010-5-26 22:07:33

你说C结果是几呢
1和2排出来的等式是一样的，同样的2个等式有无穷个解

安小安 · 发表于 2010-5-26 22:14:33

对哦对哦，明白了~谢谢呀

安小安 · 发表于 2010-5-26 22:15:34

最近脑子不好使了。。。

急求解答一个数学问题~非常非常急

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