If xy=x+y and y> 2,which of the following must be true about A.x=yB.x=0C.x=1D.0

if (w!=0 && (x+y)/wJAVA If x is a prime number,y is an integer ,and x^(21-x)=x^(y^2+3),then xy^2=_____ int x=0, y=1, z=2, w;if (x++){w = x;}else if (x++ && y >= 1){w = y;}else if (x++ && z > 1){w = z;}int x=0, y=1, z=2, w;if (x++){w = x;}else if (x++ && y >= 1){w = y;}else if (x++ && z > 1){w = z;} 执行了以下程序段后x,w的值为： 英语翻译If w=x+y+z,what is the average(arithmetic mean) of w,x,y,and z in terms of if (x>y&&x>z) w=x; 有意思 2个&&表示什么? If w = x + y + z,what is the average (arithmetic mean) of w,x,y,and z in terms of (A) w/2 (B) w/3 (C) w/4 (D) w/6 (E) w/8 A ,B.很遗憾,本题共有98人作答,正确率54.00%,包含知识点【方程式】在Satonline上面的一道SAT数学题目, If xy Then y=x^3怎么解释? GMAT If x and y are positive integers,and x^3*y^4=2000.What is the value of xy?这个...有木有技巧... |x|/x+y/|y|+xy/|xy|= 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 xy=x+y and y> 2,which of the following must be true about A.x=yB.x=0C.x=1D.0 x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? 大象、蚊子一样重?HELP!设 X=大象重量,Y=蚊子重量设 X+Y=2W{ X - 2W = -Y{ 2W - Y = X整理得{ X2 - 2WX = -XY { Y2 - 2WY = -XY合并得X2 - 2WX = Y2 - 2WYX2 - 2WX + W2 = Y2 - 2WY + W2（X - W）2 = （Y - W）2X - W = Y - WX = Y位于X 执行了以下程序段后,x,w的值为（ ）.int x=0,y=1,z=2,w;if(x++)w=x;else if(x++&&y>=1)w=y;else if(x++&&z>1)w=z;A．0,1 B．1,1 C．2,1 D．3,2 已知：X,Y,Z均大于0且小于1,X+Y+Z=2,W=XY+YZ+XZ,求W的取值范围? f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y x,y->(0,0) lim (√(4+xy)-2)/√xy√w为根号~ 求下列函数的一阶偏导数!高分! （1）u=f（x^2-y^2,e^(w^y)） (2)=f(w/y,y/z) (3)=f(x,xy,xyz)求下列函数的一阶偏导数!（1）u=f（x^2-y^2,e^(w^y)） (2)=f(w/y,y/z) (3)=f(x,xy,xyz)第二题是 x/y 不是 w