if y is a integer,then the least possible value of |23-5y|is请求来个解析····

If k is a positive even integer,then. 1：Prove that if x is a positive integer that is not divisible by 5,then x4 -1 is divisibleby 5.（证明如果X是可被5整除的整数,那么X的四次方-1也能被5整除）2：Prove that there do not exist two positive integers x and y such th If x is a prime number,y is an integer ,and x^(21-x)=x^(y^2+3),then xy^2=_____ if y is a integer,then the least possible value of |23-5y|is请求来个解析···· 求助一道gre数学题,请不会的千万不要乱回答,·if an integer is randomly selected from all positive 2-digit integers,what is the probability that the integer chosen has (a) a 4 in the tens place(b) at least one 4 in the tens place or th If positive integer x is a multiple of 6 and positive integer y is a multiple of 14,is xy a multiple of 105?(1) x is a multiple of 9.(2) y is a multiple of 25.A.Statement (1) ALONE is sufficient,but statement (2) alone is not sufficient.B.Statement ( GMAT数学求解If x, y, z areinteger and xy+z is an odd integer, is x an even integer?1) xy+xz is an even integer2) y+xz is an odd integer If k is a positive even integer,then (k+1)(k+2). 1.If x is an integer greater than 1 and if y = x + 1/x,which of the following must be true?I.y x II.y is an integer.III.xy > x^2 (A) I only (B) III only (C) I and II only (D) I and III only (E) I,II,and III If y is the smallest positive integer such that 3,150 multipliedby y is the square of an integerthen y must be:A、2 B、5 C、7 D、14 If is given that N is an integer.Prove that (a) 3(2N-1)+1 is an even number. If k is a positive integer,which of the following must represent an even integer that is twice the value of an odd integer答案是4k+2 XXX is not a valid integer value An integer c is a common divisor of two integers x and y if and only if c is a divisor of x and c is a divisor of y.Which of the following sets of integers could possibly be the set of all common divisors of two integers?A.{-6,-2,-1,1,2,6}B.{-6,-2,-1 let n≥2 be an integer.prove that n is prime if and only if for every integer a,either hcf(highest common factor) (a,n)=1 or a|n 英语翻译Is the positive integer n equal to the square of an integer?Can you give the reasoning for this qn Is the positive integer n equal to the square of an integer?(1) For every prime number p,if p is a divisor of n,then so is p2.(2) square ro 有关java.lang.NumberFormatException:null的问题Whether the price you give is rightRan)//if(Integer.parseInt(price)>Integer.parseInt(Ran)){out.println(a litle larger);out.println();flag=1;session.setAttribute(flag,flag);}if(Price运行上 What we mean is a logo that is distinctive enough if it is extracted from th