-(x平方y+3xy-4)+3(x平方y-xy-2)

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-(x平方y+3xy-4)+3(x平方y-xy-2)

-(x平方y+3xy-4)+3(x平方y-xy-2)
-(x平方y+3xy-4)+3(x平方y-xy-2)

-(x平方y+3xy-4)+3(x平方y-xy-2)
-(x平方y+3xy-4)+3(x平方y-xy-2)
=-x²-3xy+4+3x²y-3xy-6
=-x²-6xy+3x²y-2
=

-(x^2y+3xy-4)+3(x^2y-xy-2)
=-x^2y-3xy+4+3x^2y-3xy-6
=2x^2y-3xy-2