问几道题~~是PREP破解上的~~希望能给出解释

eboy911

1．         Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days of Store S sold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did Store S sell more than 11 copies on Friday?

(1)
                 Last week Store S sold 8 copies of the book on Thursday.

(2)
                 Last week Store S sold 38copies of the book on Saturday.

 

2.  Are the positive integers p and q both greater than n?

(1) p-q is greater than n

(2) q>p

 

3. Dose the integer k have a factor p such that 1<p<k?

(1)  K>4!

(2)  13! +2≤k≤13!+13

 

4.  If a<y<z<b, is∣y-a∣<∣y-b∣?

(1)  ∣z-a∣<∣z-b∣

(2)   ∣y-a∣<∣z-b∣

 

5. If ab≠0,and points(-a,b) and (-b,a) are in the same quadrant of the xy-plane,is point(-x,y) in this same quadrant?

(1)    Xy>0

(2)    Ax>0

 

 thanks a lot!!