((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy)
解,得：
==(x^2y^2-4-2x²y²+5x^2y^2-10xy^2+5y^2)÷(2xy)
==(4+4x^2y^2-10xy^2+5y^2)÷(2xy)
==2/xy+2xy-5y+2.5y/x
((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy)
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