用隐求导法求 xy^2 - yx^2 = 3xy 求dy/dx

已知yx^2+2xy^3+3=－18 求dy/dx 求方程dy/dx=(1+y^2)/(xy+yx^3)的解. 求方程(y^2+xy^2)dx+(x^2-yx^2)dy=0的通解 求dx/dy-3xy=xy^2的通解 求通解,dy/dx-3xy=xy^2 求导：xy=x-e^xy,求dy/dx (x³-2xy²)dy+(2y³-3yx²)dx=0求通解 微分求导:3X^3+2XY^2-Y=5,求dY/dX. 设e^xy-xy^2=Siny,求dy/dx 设sin（xy）-x^2y=0,求dy／dx,求导什么的都要疯了! x^2+xy+y^3=1,求dy/dx 求微分方程dy/dx+2xy=3x