原式=（x^2y^2-1）^x*(xy-1)^(y-x)/[y^(2x+y-x)*x^(y-x-2y)*(x^2y^2-1)^y*(xy-1)^(x-y)]
=(x^2y^2-1)^(x-y)*(xy-1)^(2y-2x)*y^(-x-y)*x^(x+y)
=(xy+1)^(x-y)*(xy-1)^(y-x)*x^(x+y)*y^(-x-y).
=(x^2y^2-1)^(x-y)*(xy-1)^(2y-2x)*y^(-x-y)*x^(x+y)
=(xy+1)^(x-y)*(xy-1)^(y-x)*x^(x+y)*y^(-x-y).
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