[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy

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[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以

[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy
[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy

[(xy+3)(xy-3)-3(x的2次方y的2次方-3)]除以xy
=[x^3y^2-x^2y-x^2y+x^3y^2]/3x^2y
=[2x^3y^2-2x^2y]/3x^2y
=2(xy-1)/3