√88x(x+y)⁴÷√11(x+y)²
(三分之二x√9x +6x√x/y)+(y√y/x -x²√x/1)
求导:y=√(x²+x)
将(√x-y)/(x-y)÷√(xy/x³-x²y)(x>y>0)化简
因式分解:x²(x-y)+(y-x)
化简:(x+y)÷(√x-√y)-2xy÷(x√y-y√x)
{(x,y) |x|+|y|
x>y?x:y
计算 [12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²
解方程组x+y+√(x+y)=20;x²+y²=136
若实数x,y满足x的平方+2√3x+根号(x+y+1)+3=0,求代数式(1/x-y+1/x+y)÷y/(x²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
先化简,再求值:[x²÷(x-y)]-[y²÷(x-y)],其中x=1+2√3,y=1-2√3