化简:[(xy-2)(xy+2)-2x2y2+4]÷(xy).
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化简:[(xy-2)(xy+2)-2x2y2+4]÷(xy).
[(xy-2)(xy+2)-2x2y2+4]÷(xy),
=(x2y2-4-2x2y2+4)÷(xy),
=(-x2y2)÷(xy),
=-xy
=(x2y2-4-2x2y2+4)÷(xy),
=(-x2y2)÷(xy),
=-xy
化简:[(xy-2)(xy+2)-2x2y2+4]÷(xy).
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