若|x-2y+1|+|x+y-5|=0,则2^2+y^2

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 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 若|x-2y+1|+|x+y-5|=0,则2^2+y^2 若x²-4xy+5y²-2y+1=0,求x,y (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. x*x+2x+y*y-4y+5=0 x= y= 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 若x*x+y*y=x+y-1/2,求x,y的值如题 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 若2x-5y=0,则y：x (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求2x+2√x*√y+3y/x-√x*√y+y 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=