(1/2m-1/3n)的平方×(1/2m+1/3n)的平方

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(1/2m-1/3n)的平方×(1/2m+1/3n)的平方


(1/2m-1/3n)²×(1/2m+1/3n)²
=[(1/2m-1/3n)(1/2m+1/3n)]²
=(1/4m²-1/9n²)²
=1/16m^4-1/18m²n²+1/81n^4