计算 2xy[4x²y²-3y（xy+x²y）-xy²]（2x-x²-3）（x³-x²-2）（x²）³-2x³[x³-x²（4x+1）]（-1/3xy）²·[xy（2x-y）-3x（xy-y²）]

计算 2xy[4x²y²-3y（xy+x²y）-xy²]（2x-x²-3）（x³-x²-2）（x²）³-2x³[x³-x²（4x+1）]（-1/3xy）²·[xy（2x-y）-3x（xy-y²）]
计算 2xy[4x²y²-3y（xy+x²y）-xy²]
（2x-x²-3）（x³-x²-2）
（x²）³-2x³[x³-x²（4x+1）]
（-1/3xy）²·[xy（2x-y）-3x（xy-y²）]

计算 2xy[4x²y²-3y（xy+x²y）-xy²]（2x-x²-3）（x³-x²-2）（x²）³-2x³[x³-x²（4x+1）]（-1/3xy）²·[xy（2x-y）-3x（xy-y²）]
2xy [4x²y²-3y(xy+x²y)-xy²]
= 2xy [4x²y²-3xy²-3x²y²-xy²]
= 2xy [x²y²-4xy²]
= 2x³y³-8x²y³
（2x-x²-3）（x³-x²-2）
= (-x²+2x)(x³-x²) - 3(x³-x²) - 2(-x²+2x)+6
= -x³ (x-2)(x-1) - 3x³+3x²+2x²-4x+6
= -x³ (x²-3x+2) - 3x³+3x²+2x²-4x+6
= -x^5+3x^4-2x³ - 3x³+3x²+2x²-4x+6
= -x^5+3x^4-5+5x²-4x+6
（x²）³-2x³[x³-x²（4x+1）]
= x^6-2x³(x³-4x³-x²)
= x^6-2x³(-3x³-x²)
= x^6+ 6x^6+2x^5
= 7x^6+2x^5
（-1/3xy）²·[xy（2x-y）-3x（xy-y²）]
= (1/9x²y²)·(2x²y-xy²-3x²y+3xy²)
= (1/9x²y²)·(-1x²y+2xy²)
= -1/9x^4y³ +2/9x³y^4

=2x³y³-8x²y³