化简:1.(x-y)×√1/y-x+1/2④√x²-2xy+y² ④表示在根号前开四次
化简:1.(x-y)×√1/y-x+1/2④√x²-2xy+y² ④表示在根号前开四次
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
【(x-y)^3(x^1/2+y^1/2)^-3+3(x根号y-y根号x)】/(x根号x+y根号y)+(2xy根号xy-
x+y=3,xy=-2,试求代数式(1)(x-y)²; (2) x的四次方+y的四次方的值.
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-
化简(y根号x+x根号y)/(xy-y²)-(x+根号xy+y)/(x根号x-y根号y).
化简:[(x×根号x+x×根号y)/(xy-y²)]-[(x+根号下xy+y)/(x×根号x-y×根号y)]
计算:【(根号2y-x)-(根号3x/y)】根号6xy-【(1/3(根号75y²)-(根号18x²)
已知xy=-1,求代数式-1/2x(xy²-y-x³y的四次方)
已知y<根号x-1+根号1-x+二分之一,化简y-x分之根号x²-2xy+y²
若实数x,y满足x根号(1-x)=根号(y-2)+根号(x-1),求3x²+xy-y²/x²
化简:((根号x-根号y)^3+2x根号x+y根号y)/(x根号x+y根号y)+(3根号xy-3y)/(x-y)