1.x-y
2.ax-ay+3
3.x-y+3
4.18x²(x-2y)²-24xy(2y-x)²-6x(2y-x)³
=(x-2y)²(18x²-24xy+6x(x-2y))
=(x-2y)²(18x²-24xy+6x²-12xy)
=(x-2y)²(24x²-36xy)
=12x(x-2y)²(2x-3y)
代入x=-3,y= -1
=108
1.x-y
2.ax-ay+3
3.x-y+3
4.18x²(x-2y)²-24xy(2y-x)²-6x(2y-x)³
=(x-2y)²(18x²-24xy+6x(x-2y))
=(x-2y)²(18x²-24xy+6x²-12xy)
=(x-2y)²(24x²-36xy)
=12x(x-2y)²(2x-3y)
代入x=-3,y= -1
=108