√X/Y+Y/X+2-√X/Y-√Y/X(注√X/Y+Y/X+2在一个根号2中)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
1、x(x-y)(x+y)-x(x+y)^2
对于任意非零自然数x、y,规定符号“√”表示一个运算,且x√y={[x*x-x*(x-1)]+y*y*y-5.2}*2-
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)
(1)(x^2/x)-y-x-y
【(x-y)^2+(x+y)(x-y)】除以 2x
计算:(2/3x√9x+6x√y/x)+(y√x/y-√1/x)
√x+√y≤k√(2x+y)
{(x,y) |x|+|y|
x>y?x:y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
y=ln(x+√x^2+1),求y