dy/dx = x(y^5-6y), dy/(y^5-6y) = xdxx^2 = ∫2dy/[y(y^4-6)] = (-1/3)∫[1/y-y^3/(y^4-6)]dy= (-1/3)ln|y| + (1/12)ln|y^4-6| + C也可按贝努里方程来解。
