已知√x(√x+2√y)=√y(6√x-4√y)求x+√xy -y/2x+√xy+3y
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
先化简再求值(6x√y/x +3/y*√xy^3)-(4x√x/y +√36xy) 已知X=3/2,y=27
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
帮个忙啦 已知x+y=-6 xy=8 求√y/x+√x/y
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|x²-2xy-8y²|+2√x²-4xy+4y²-1=0,求3x+6y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)
已知x²+y²-4x-2y+5=0,求代数式[(√x-√y)²+4√xy]/(x+√xy)
已知:x²+y²-4x-2y+5=0,求x+√xy分之(√x-√y)²+4√xy的值.
已知实数x,y满足x^2+√2y=√3,y^2+√2x=√3,求x+y和xy的值
设√x(√x-√y)=√xy+3y,求2x+3√xy-y/3x-y的值.
1.若x-2√xy-3y=0 x>0求2x+y+√xy除以y-x-√xy