若X^2+XY=2,XY—Y^2=-7,则X^2+Y^2=( );X^2+3XY-2Y^2=( )
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若X^2+XY=2,XY—Y^2=-7,则X^2+Y^2=( );X^2+3XY-2Y^2=( )
![若X^2+XY=2,XY—Y^2=-7,则X^2+Y^2=( );X^2+3XY-2Y^2=( )](/uploads/image/z/19111411-19-1.jpg?t=%E8%8B%A5X%EF%BC%BE2%2BXY%EF%BC%9D2%2CXY%E2%80%94Y%EF%BC%BE2%EF%BC%9D%EF%BC%8D7%2C%E5%88%99X%EF%BC%BE2%2BY%EF%BC%BE2%EF%BC%9D%EF%BC%88+%EF%BC%89%EF%BC%9BX%EF%BC%BE2%2B3XY%EF%BC%8D2Y%EF%BC%BE2%EF%BC%9D%EF%BC%88+%EF%BC%89)
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