求高人设方程.当x=5,y=21 ;x=2,y=51;x=1,y=52
设函数y=y(x)由方程y+e^(x+y)=2x确定,求dx/dy
设实数x、y满足方程2x²+3y²=6y,求x+y的最大值
设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+2
设函数y=y(x)由方程cos(x+y)+y=1确定,求dy/dx
设y=y(x)由方程cos(x+y)+y=1确定,求dy/dx
设函数y=y(x)由方程arcsinx·lny-e^2x+3y=o,求当x=0时的dy/dx
设函数y=y(x)由方程x^2+y^2=1确定,求dy/dx
设函数y=y(x)由方程x^2+y^2=1确定,求dy/dx
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
圆x^2+y^2=1,求点[(x(x+y),y(x+y)]的轨迹方程