已知圆x^2+y^2-6x+Dy+16=0的圆心到原点的距离为5,求D答案是+8或-8

已知x=y^2-4y,求dy/dx y=x^2x,求dy 已知y=x^cosx/2,求dy/dx, 已知y=xe^-x^2,求dy 已知y=xe^-x^2,求dy (x^2)dy+（y^2)dx=dx-dy 已知y=x^y,求dy 已知x^y-y^x=2确定函数y=fx,求dy/dx MATLAB问题：y=dsolve('(Dy)^2-x*Dy+y=0','x'),y(1)是个什么东西?y=dsolve('(Dy)^2-x*Dy+y=0','x')ezplot(y(1),[-6,6,-4,8],1)已知：y(1)=x^2/4y(1)是个什么东西? y=e^2x,dy= 微分方程 dy/dx=(-2x)/y y=sinx/x^2,求dy y=x×2^arcsinx 求dy y=e^-x^2,求dy y=e^2x则dy? y=(tanx)/x^2,求dy y=xsin 2x,求dy y=(cos^2x) 求dy