若x—y=2009,xy=—1,则-X^2y+xy^2=

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若x—y=2009,xy=—1,则-X^2y+xy^2=若x—y=2009,xy=—1,则-X^2y+xy^2=若x—y=2009,xy=—1,则-X^2y+xy^2=-X^2y+xy^2=-xy(x

若x—y=2009,xy=—1,则-X^2y+xy^2=
若x—y=2009,xy=—1,则-X^2y+xy^2=

若x—y=2009,xy=—1,则-X^2y+xy^2=
-X^2y+xy^2
=-xy(x-y)
=2009