化简(x-4y)/(√x-2√y)-【(x+y+2√xy)/(x+√xy)】√/(√x/x+√y√y)
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
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.
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
先化简再求值 [(1/(x-y)+1/(x+y)]-【2y/(x的平方-2xy+y的平方)】 其中x=1+√2,y=1-
将(√x-y)/(x-y)÷√(xy/x³-x²y)(x>y>0)化简
化简:(x+y)÷(√x-√y)-2xy÷(x√y-y√x)
(4x-2y-1)²+√xy-2=0,求4x²y-4x²y²+xy²
已知(4x-y-1)的平方+√x+y-2=0,求4x的平方y-4xy+xy的平方
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
已知√x+y-3+绝对值xy+x+y-2l =0求x/y+y/x的值(初一)