计算√(1/x^2+y^2)

计算√(1/x^2+y^2) 计算(x+y-1)^2 计算:2/x+1/(x-y) 计算2x/x-y (x+y)(x-y)-(2x+y)(x-y+1)计算要过程 计算：1/x^2-y^2+2/(x-y)^2 计算：1/(x-y)+1/(2y-2x) 计算(2x+y+1)(2x+y-1) 计算：1(y-x)+1/(2y-2x) x^-2-y-2分之x^-1-y^-1计算 计算(2x-y+1)(2x+y-1) 计算(x-2y+1)(x+2y+1) 计算(X+2Y-1)(X+2Y+1) 计算-1/9(x+y)^2+(x-y)^2 计算：5x-2y-6+ (1/x) + (1/y) (2x+y)(x+3y-1)计算 计算x^2y^-3（x^-1y）^3 计算:(x+2y)(2x-y)