若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值

若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值 如果x:y=5:2那么x=y乘(),y=x乘() y'(x)=-5x.y(x)+ax求方程不是。是乘y(x) 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ (x-y)3乘(y-x)4 若x,y是正整数,且3^x乘3^y=3^5,则x,y的值有几对? (X-Y)^3乘(X-Y)^2乘(Y-X)=? 若2x+y=5,则4x乘2y=? 若2x+y=5,则4x乘2y= 若3x+5y-3=0求8^x乘32^y y/5x乘15x平方/y怎么做 (2x-y)的平方乘(2x+y)=? (x-y)乘（Y-X)的立方= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x x+y/根号X-根号Y-2XY/X乘根号Y-Y乘根号X 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值