先化简,再求值:根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^y,其中x=3,y=2,
先化简,再求值:根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^2y,其中,x=3,y=2
先化简,再求值:根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^y,其中x=3,y=2,
化简求值:根号x^-2xy+y^2 + x^2 -6xy+9y^2/x-3y,其中x=根号3,y=根号5
先化简,在求值:(x+根号xy)/(y+根号xy)+((根号xy)-y)/(x-根号xy),其中x=根号3+1,y=根号
先化简再求值:xy^3÷(-xy)+(x+2y)(x-2y),其中x=根号2,y=1
设x>0,y>0,且根号x(根号x+根号y)=3根号y(根号x+5根号y),求代数式2x+根号xy+2y\x-根号xy-
已知x,y为正数,且根号x(根号x+根号y)=3根号y(根号x+5根号y),求:(2x+根号xy+3y)/(x+根号xy
若x>o,y>o,且根号x(根号x+根号y)=3根号y(根号x+5根号y)求x+根号xy分之2x-根号xy-5y
先化简,再求值x^2-xy/xy-y^2,其中x=根号24,y=根号32
x^2-3x分之3y-xy,其中x=根号2,y=-2 先化简,再求值
根号X(根号X+根号Y)=3根号Y(根号X+5根号Y),求(X+根号XY-Y)分之(2X+根号XY+3Y)的值
代数式求值.已知x=2,y=根号3,求 (根号x-根号y)/(根号x+根号y)+(根号x+根号y)/(根号x-根号y)