( )(-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

( )(-1/3m^2-1/2n)=1/4n^2-1/9m^4
你想解决什么问题?你是-1/(3m²)还是-(1/3)m²,其它类似,请说明.