(4m^2+9n^2)(3n-2m)(-3n-2m) 请帮我算一下
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(4m^2+9n^2)(3n-2m)(-3n-2m)
=-(4m^2+9n^2)(3n-2m)(3n+2m)
=-(4m^2+9n^2)(9n^2-4m^2)
=-(81n^4-16m^4)
=16m^4-81n^4
=-(4m^2+9n^2)(3n-2m)(3n+2m)
=-(4m^2+9n^2)(9n^2-4m^2)
=-(81n^4-16m^4)
=16m^4-81n^4
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