请教两道数学题，急！

Rapunzel36 · 发表于 2010-2-12 16:15:22

For every positive even integer n,the function (n) is defined to be the product of all the even integers from 2 to n,inclusive.If p is the smallest prime factor of h(100)+1,then p is
A.between 2 and 10
B.between 10 and 20
C.between 20 and 30
D.between 30 and 40
E.greater than 40
答案选E,请问应该怎么思考这题.

When a certain tree was first planted,it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years.At the end of the 6th year,the tree was 1/5 taller than it was at the end of the 4th year.By how many feet did the height of the tree increase each year?
A3/10
B.2/5
C.1/2
D.2/3
E.6/5
题目是什么意思呀？我觉得应该是1/10的，是理解错误么？

jeannefq · 发表于 2010-2-12 20:34:08

第二题是D不？

jeannefq · 发表于 2010-2-12 20:39:32

第一题请参考：
http://forum.chasedream.com/GMAT_Math/thread-438949-1-2.html

Rapunzel36 · 发表于 2010-2-13 18:37:12

对，是D,怎么算的呀？

bosen2009 · 发表于 2010-2-13 21:38:08

列个方程就行了啊
假设每年长x
（4+4x）*（1+1/5）=4+6x

Rapunzel36 · 发表于 2010-2-14 19:00:51

噢～～！那个1/5是说倍数不是说长度呀！
懂了。。。
谢谢～

请教两道数学题，急！

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