[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)][(x^-2)(y^-2)]÷[(x^-1)-(y^-2)]注:/为分数线

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[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)][(x^-2)(y^-2)]÷[(x^-1)-(y^-2)]注:/为分数线[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)][

[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)][(x^-2)(y^-2)]÷[(x^-1)-(y^-2)]注:/为分数线
[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)]
[(x^-2)(y^-2)]÷[(x^-1)-(y^-2)]
注:/为分数线

[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)][(x^-2)(y^-2)]÷[(x^-1)-(y^-2)]注:/为分数线
(1)
[(a^-2)-(b^-2)]÷[(a^-1)-(b^-1)]={[(a^-1)-1]-[(b^-1)-1]}/[(a^-1)-(b^-1)]=
[(a^-1)-(b^-1)]÷[(a^-1)-(b^-1)]=1