2/1(x2-y)+3/1(x-y2)+6/1(x2+y2)

2/1(x2-y)+3/1(x-y2)+6/1(x2+y2)
2/1(x2-y)+3/1(x-y2)+6/1(x2+y2)

2/1(x2-y)+3/1(x-y2)+6/1(x2+y2)
2/1(x²-y)+3/1(x-y²)+6/1(x²+y²)
={1/6[2/1(x²-y)+3/1(x-y²)+6/1(x²+y²)]}*6
=(3x²-3y+2x-2y²+x²+y²)*6
=(4x²-3y+2x-y²)*6
=[2x(x+1)-y(y+3)]6
=12x(x+1)-6y(y+3)

原式=2/1x²-2/1y+3/1x-3/1y²+6/1x²+6/1y²
=3/2x²-6/1y²-2/1y+3/1x