(3m+3n)^2乘(2m-3n)^2过程
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(3m+3n)^2乘(2m-3n)^2过程
![(3m+3n)^2乘(2m-3n)^2过程](/uploads/image/z/19864040-32-0.jpg?t=%283m%2B3n%29%5E2%E4%B9%98%282m-3n%29%5E2%E8%BF%87%E7%A8%8B)
原式=[(3m+3n)(2m-3n)]^2
=(6m^2-3mn-9n^2)^2
=36m^4+9m^2n^2+81n^4-36m^3n-108m^2n^2+54mn^3
=36m^4+81n^4-36m^3n-99m^2n^2+54mn^3
=(6m^2-3mn-9n^2)^2
=36m^4+9m^2n^2+81n^4-36m^3n-108m^2n^2+54mn^3
=36m^4+81n^4-36m^3n-99m^2n^2+54mn^3
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