((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5
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((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5((xy+2)(xy-2)-
((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5
((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5
((xy+2)(xy-2)-2x^2y^2+4)除以2xy,其中x=10,y=-1/5
解
((xy+2)(xy-2)-2x^2y^2+4)除以2xy
=(x²y²-4-2x²y²+4)/(2xy)
=(-x²y²)/(2xy)
=-xy/2
=-[10*(-1/5)]/2
=2/2
=1
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