请教NN两道prep数学。。。

peanut54321 · 发表于 2011-7-14 18:58:41

数学太弱了，求nn指教
1. For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusve. If p is the smallest prime factor of h(100)+1, then p is_____
答案是 greater than 40
另一道，貌似挺简单，但怎么算都不是那个结果，是不是理解的不对啊，题如下：
When a certain tree was fisrt planted, in 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 4th year. By how many feet did the height of the tree increased each year?
答案是 2/3

Heather_Lau · 发表于 2011-7-14 19:14:21

1题不会.
2.constant amount is x,4+6x=(1+1/5)(4+4x),so x is 2/3.

mackay · 发表于 2011-7-14 19:22:23

第一体选项有比40大的吗？如果没有就简单了。 h(100)必被50!2*50整除 40是50!的因子，除后余1所以不能整除

mackay · 发表于 2011-7-14 19:23:36

打错了 2^50

peanut54321 · 发表于 2011-7-14 19:43:40

嗯嗯非常感谢杀G顺利~

peanut54321 · 发表于 2011-7-14 19:44:33

选项中没有比40大的~~多谢指点祝杀G顺利

mackay · 发表于 2011-7-14 22:19:20

借您吉言

请教NN两道prep数学。。。

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