Identify the correct decreasing order of stability of complexes formed by divalent metal ions with same ligand.

The general solution of

$x(x-1) \frac{\mathrm{d} y}{\mathrm{~d} x}=x^3(2 x-1)+(x-2) y$ is

The direction cosines of the line $x-y+2 z=5$ and $3 x+y+z=6$ are

20 is divided into two parts so that the product of the cube of one part and the square of the other part is maximum, then these two parts are