若x、y和z为正整数使得x2+y2=2xyz,求z的值.If x, y and z are positive integers such that x2+y2=2xyz.
Problem Solving 试题详情 题目: Ifx,y, andzare positive integers such thatxis a factor ofy, andxis a multiple ofz, which of the following is NOT necessarily an integer? 选项: A、x+zz B、y+zx C、x+yz D、xyz E、yzx 答案: B
且x是y的倍数的y有无穷多个,此时y既可以等于2,也可以不等于2;根据(2)可设x+2=ny,由x是y的倍数可设x=my,其中m和n都是正整数,把这两个式子相减可得(n-m)y=2,因为n-m和y都是正整数,所以当n-m取1时,y取2,当n-m取2时,y取1,因此(2)也不充分;根据以上分析可知(1)+(2)时,y=2,所以(1...
If x, y, and z are positive integers such that x is a factor of y, and x is a multiple of z, which of the following is NOT necessarily an integer?
If x, y,and z are positive integers, is xz even?(1)xy is even.(2)yz is even._出国考试答疑器_GMAT_试题_Data Sufficiency
If x and y are positive integers such that 3x+7y=88. Find the maximum value of x+y.已知x、y为正整数且3x+7y=88,求x+y的最大值. 答案 28. 相关推荐 1If x and y are positive integers such that 3x+7y=88. Find the maximum value of x+y.已知x、y为正整数且3x+7y=88,求x+y的...
If x and y are positive integers and 3x-9y=27, find the minimum value of x-y.若x和y是正整数且3x-9y=27﹐求x-y的最小值. 相关知识点: 试题来源: 解析 11.3x-9y=27,x-3y=9,y=1,2,3,⋅⋅x=12,15,18⋯x-y=11,13,15,⋅⋅∴x-y的最小值为11. ...
If x, y, and z are positive integers and x2=y2+z2, which of the following must be true?Ⅰ.x>z Ⅱ.x=y+z Ⅲ.y2+z2 is a positive integerA.Ⅰ onlyB.Ⅱ onlyC.Ⅲ onlyD.Ⅰ and Ⅱ onlyE.Ⅰ and Ⅲ only的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)
百度试题 结果1 题目 If x, y are positive integers such that 5x+3y=37, find the minimum value of x+y. 已知x、y为正整数且5x+3y=37,求x+y的最小值. 相关知识点: 试题来源: 解析 9. 反馈 收藏
对2000进行分解质因数，得到2000=2*2*2*2*5*5*5 然后对分解的得到数进行组合，刚好x=5，y=2 所以xy=10 如果只是针对这道题的话，x^3*y^4=(xy)^3*y 而2000=10^3*2,所以xy=10