化简(4分×4,共16分) 小题1:(1)2 x 2 y -2 xy -4 xy 2 + xy +4 x 2 y -3 xy 2 小题2:(2) 3 (4 x 2 -3 x +2)-2 (1-4 x 2 + x ) 小题3:(3)5 abc -2 a 2 b -[ 3 abc -3 (4 ab 2 + a 2 b )] 小题4: (4) (2 x 2 + x )-2[ x 2 -2(3 x 2 - x )]
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