若[x-y]+[y-5]=0,求2x+y.[ ]表示绝对值的符号

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 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若2x-3y=0,求5x+4y/3x-2y 若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求2x+2√x*√y+3y/x-√x*√y+y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若实数x、y满足x平方+y平方-4x-2y+5=0,求根号8y-2x分之（根号x）+y 若实数X,Y满足x²+y²-4x-2y+5=0求√x+y/√8y-2x 若x*x+4*y*y+2*x-4*y+2=0,求5*x*x+16*y*y的算术平方跟 若实数x、y满足x*x+y*y-2x+4y+5=0,求x-y的值 x*x+y*y-2x+4y+5=0求x, 若[x-y]+[y-5]=0,求2x+y.[ ]表示绝对值的符号 若x²-4xy+5y²-2y+1=0,求x,y 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-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 若(x+y)(x+y-1)-2=0,求x+y的值求