prep几道数学求助..

临莅

昨天半夜模考。。数学狂错12道。。不过居然有49。。大概错的没被抽到吧。。

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,inclusive.If p is the smallest prime factor of h(100)+1,the P is:

A,2~10  b. 10~20 c. 20~30 d.30~40 e.greater than 40

If n and y are positive integers and 450y=n^3 which of the following must be an integer?

1,y/(3*2^2*5)

2,y/(3^2*2*5)

3,y/(3*2*5^2)




On the number line,the distance between x and y is greater than the distance between x and z.

Does z lie between x and y?、
（1）xyz<0
(2) xy<0