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[(2/3xy-2)(2/3xy+2)-(xy+2)²+8]÷(-1/2xy)
=-[4/9xy^2-2^2-xy^2-4xy-4+8]÷1/2xy
=-[-5/9xy^2-4xy]÷1/2xy
=(5/9xy^2-4xy)÷1/2xy
=10/9xy-8
=-[4/9xy^2-2^2-xy^2-4xy-4+8]÷1/2xy
=-[-5/9xy^2-4xy]÷1/2xy
=(5/9xy^2-4xy)÷1/2xy
=10/9xy-8
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