作业帮9.若x²+xy=2,xy+y²=-1,则x²+2xy+y²的值为_____________.
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9.若x²+xy=2,xy+y²=-1,则x²+2xy+y²的值为_____________.
9.若x²+xy=2,xy+y²=-1,则x²+2xy+y²的值为_____________.
9.若x²+xy=2,xy+y²=-1,则x²+2xy+y²的值为_____________.
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