、化简(4分×4,共16分)
(1)2x2y-2xy-4xy2+xy+4x2y-3xy2 (2) 3 (4x2-3x+2)-2 (1-4x2+x)
(3)5abc-2a2b-[ 3abc-3 (4ab2+a2b)] (4) (2x2+x)-2[x2-2(3 x2-x)]
、化简(4分×4,共16分)
(1)2x2y-2xy-4xy2+xy+4x2y-3xy2 (2) 3 (4x2-3x+2)-2 (1-4x2+x)
(3)5abc-2a2b-[ 3abc-3 (4ab2+a2b)] (4) (2x2+x)-2[x2-2(3 x2-x)]