Formulating first, the square of x plus y equals 3XY, then moving XY to the left, dividing the square of x plus y by XY equals 3, and then getting (x square +2XY+Y square) divided by XY equals 3, and then changing it into x square divided by XY+2XY divided by XY+Y square divided by XY=3. . . You should know the following, right Just cut off the same numerator and denominator.