已知x=√(6-2√5),y=√(3-2√2),求(x+y-2√(xy))/(√x-√y)+(y-x)/(√x+√y)+
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
已知y=√(x-8)+√(8-x)+18,求代数式 (x+y)/(√x-√y)-2xy/(x√x-y√x) 的值
已知x,y为正数,且√x(√x+√y)=3√y(√x+5√y),求(2x+√xy+3y)/(x+√xy-y)
先化简再求值(6x√y/x +3/y*√xy^3)-(4x√x/y +√36xy) 已知X=3/2,y=27
帮个忙啦 已知x+y=-6 xy=8 求√y/x+√x/y
已知实数x,y满足x^2+√2y=√3,y^2+√2x=√3,求x+y和xy的值
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求(2x+2√xy+3y)/(x-√xy+y)的值.
若x、y为整数,√x(√x+√y)=3√y(√x+5√y),试求2x+(√xy)+3y除以x+(√xy)+y
当x>0,y>0且√x(√x+√y)=3√y(√x+5√y),求2x+(√xy)+3y/x+(√xy)-y的值
已知实数x,y满足关系式| x+y-7 |+√(xy-6)=6,求(x+2y)÷(y-x)的值
已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)