原式化简为:
2(x³-2y²)-(x-2y)-(x-3y²+2x³)
=2x³-4y²-x+2y-x+3y²-2x³
= -y²-2x+2y
将x=﹣3,y=﹣2代入“-y²-2x+2y”,得:
-y²-2x+2y
=-(-2)²-2(-3)+2(-2)
= -4+6-4
= ﹣2
原式化简为:
2(x³-2y²)-(x-2y)-(x-3y²+2x³)
=2x³-4y²-x+2y-x+3y²-2x³
= -y²-2x+2y
将x=﹣3,y=﹣2代入“-y²-2x+2y”,得:
-y²-2x+2y
=-(-2)²-2(-3)+2(-2)
= -4+6-4
= ﹣2