有几道数学题不太懂帮忙解答下好吗？

项心の鈊 · 发表于 2011-10-26 21:30:33

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 from her take-home pay, what fraction of her take-home pay did she save each month?

(A) 1/2
(B) 1/3
(C) 1/4
(D) 1/5
(E) 1/6

为什么是D 不太明白~

项心の鈊 · 发表于 2011-10-27 19:51:25

谢谢楼上~明白了哈~

zjszjs · 发表于 2011-10-27 08:57:27

由1得：Sn=3124
由2得：Sn/n=4
所以1和2 合起来充分

项心の鈊 · 发表于 2011-10-26 22:37:36

顶上去这题真心盼解答呀~

项心の鈊 · 发表于 2011-10-26 22:09:53

If the terms of a sequence are t1,t2,t3...tn, what is the value of n?

(1) the sum of the n terms is 3124
(2) the average(arithmetic mean) of the n terms is 4.

这个题为什么是C 呢？

你家兜爷 · 发表于 2011-10-26 22:00:59

就是这个~看了你的式子明白好多~谢谢啦~

-- by 会员项心の鈊 (2011/10/26 21:57:57)

客气~

项心の鈊 · 发表于 2011-10-26 21:57:57

就是这个~看了你的式子明白好多~谢谢啦~

crusaderma · 发表于 2011-10-26 21:55:38

+   X   Y   Z
4   1   -5   M
E   7   N   10
F   2   -4   5

In the addition table shown above, what is the value of M + N =?

A.   -19
B.   4
C.   5
D.   6
E.   22

是不是这道题啊，
m + n = z + 4 + y + e = (z + e) + (y + 4) = 10 + (-5) = 5

项心の鈊 · 发表于 2011-10-26 21:50:31

我做数学 PS部分还好错了3道错了好多DS的题看来还是得加强练习了~

项心の鈊 · 发表于 2011-10-26 21:49:50

恩呢明白了就是一看这个一下没理解是什么意思做数学做的脑袋都蒙掉了

有几道数学题不太懂帮忙解答下好吗？

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有几道数学题不太懂 帮忙解答下好吗？

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有几道数学题不太懂帮忙解答下好吗？