X+Y=-1,XY=3求5(XY+2Y)+(6X-(2XY+Y-3X))的值
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X+Y=-1,XY=3求5(XY+2Y)+(6X-(2XY+Y-3X))的值
![X+Y=-1,XY=3求5(XY+2Y)+(6X-(2XY+Y-3X))的值](/uploads/image/z/3457445-5-5.jpg?t=X%2BY%3D-1%2CXY%3D3%E6%B1%825%28XY%2B2Y%29%2B%286X-%282XY%2BY-3X%29%29%E7%9A%84%E5%80%BC)
5(XY+2Y)+(6X-(2XY+Y-3X))
=5XY+10Y+(6X-2XY-Y+3X)
=5XY+10Y+6X-2XY-Y+3X
=(5XY-2XY)+(6X+3X)+(10Y-Y)
=3XY+9X+9Y
=3XY+9(X+Y)
=3*3+9*(-1)
=9-9
=0
=5XY+10Y+(6X-2XY-Y+3X)
=5XY+10Y+6X-2XY-Y+3X
=(5XY-2XY)+(6X+3X)+(10Y-Y)
=3XY+9X+9Y
=3XY+9(X+Y)
=3*3+9*(-1)
=9-9
=0
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