( )(-1/3m^2-1/2n)=1/4n^2-1/9m^4

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()(-1/3m^2-1/2n)=1/4n^2-1/9m^4()(-1/3m^2-1/2n)=1/4n^2-1/9m^4()(-1/3m^2-1/2n)=1/4n^2-1/9m^4(-1/2n+1/3

( )(-1/3m^2-1/2n)=1/4n^2-1/9m^4
( )(-1/3m^2-1/2n)=1/4n^2-1/9m^4

( )(-1/3m^2-1/2n)=1/4n^2-1/9m^4
(- 1/2n+1/3m^2 )(-1/3m^2-1/2n)=1/4n^2-1/9m^4

同意妙酒的回答。