计算题:(2m-3n)²(2m+3n)²要过程哦!

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计算题:(2m-3n)²(2m+3n)²要过程哦!
计算题:(2m-3n)²(2m+3n)²
要过程哦!

计算题:(2m-3n)²(2m+3n)²要过程哦!
原式=[(2m-3n)(2m+3n)]²
=[(2m)²-(3n)²]²
=[4m²-9n²]²
=16m^4-72m²n²+81n^4

=(2m-3n)(2m+3n)²
=[(2m)²-(3n)²]²
=(4m²-9n²)²
=16m^4-72m²n²+81n^4