设x+y=0 ,xy=11,求x*x-xy+y*y
设xy>0,且xy=4x+y+12,求xy的最小值
设|X-2|+(Y+1/4)^2=0,试求代数式X^2(X^2-XY+Y)-X(X^3-2X^2Y+XY-1)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
设 e^(x+y) - xy = 1,求 dy/dx \ x=0 y=0
设e^(x+y)+cos(xy)=0确定y是x的函数求dy
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
设y=y(x)由方程e^xy+cos(xy)=y确定,求dy(0).
设函数y=y(x)由方程e^y+xy+e^x=0确定,求y''(0)
设y=y(x)由方程e^y-xy=0所确定,求y'(x)