(2mn+1)(2mn-1)-(2m²n²+2)怎么算啊?

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(2mn+1)(2mn-1)-(2m²n²+2)怎么算啊?
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(2mn+1)(2mn-1)-(2m²n²+2)怎么算啊?
(2mn+1)(2mn-1)-(2m²n²+2)怎么算啊?

(2mn+1)(2mn-1)-(2m²n²+2)怎么算啊?
原式=4m² n ²-1-2m² n ²-2
=2m² n ²-3