3x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2其中x=2,y=4分之1
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3x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2其中x=2,y=4分之13x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2其中x=2,y=4分之13x^2
3x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2其中x=2,y=4分之1
3x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2
其中x=2,y=4分之1
3x^2y^2+2xy-7x^2y^2-2分之3xy+2+4x^2y^2其中x=2,y=4分之1
3x²y²+2xy-7x²y²-3/2 xy+2+4x²y²
=(3-7+4)x²y²+(2-3/2)xy
=1/2 xy
当x=2,y=1/4时
原式= 1/2 X 2 X 1/4=1/4
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