Y=X is substituted into x 2+3y 2 = 6y of x 2+3x 2 = 6x, and the solution is X=0 or 1.5.

When X=0, y = 0；; When X= 1.5, Y= 1.5.

X= radical sign (6y-3y 2) is derived from x2+3y 2 = 6y.

So s is small = ∫ (0, 1.5)[ root number (6y-3y 2)-y] dy (you can use the integral formula set later).