﹙1﹚原式=2x+3y-2xy-x-4y-xy-3xy-2y+2x
=3x-3y-6xy
=3﹙x-y﹚-6xy
=3×2^2009-6×3^2010
=3^2010-6×2^2010
=﹣5×3^2010.
﹙2﹚这个二次三项式是:x²+2x-1.
﹙1﹚原式=2x+3y-2xy-x-4y-xy-3xy-2y+2x
=3x-3y-6xy
=3﹙x-y﹚-6xy
=3×2^2009-6×3^2010
=3^2010-6×2^2010
=﹣5×3^2010.
﹙2﹚这个二次三项式是:x²+2x-1.