计算;(2m+3n)^2(2m-3n)^2

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计算;(2m+3n)^2(2m-3n)^2计算;(2m+3n)^2(2m-3n)^2计算;(2m+3n)^2(2m-3n)^2(2m+3n)^2(2m-3n)^2=(2m+3n)(2m-3n)(2m+

计算;(2m+3n)^2(2m-3n)^2
计算;(2m+3n)^2(2m-3n)^2

计算;(2m+3n)^2(2m-3n)^2
(2m+3n)^2(2m-3n)^2=(2m+3n)(2m-3n)(2m+3n)(2m-3n)=(4m^2-9n^2)(4m^2+9n^2)=16m^4-81n^4

(2m+3n)^2(2m-3n)^2
=((2m+3n)(2m-3n))^2
=(4m^2-9n^2)^2
=16m^4-72m^2n^2+81n^4