计算题:(2m-3n)²(2m+3n)²
要过程哦!
人气：334 ℃ 时间：2020-06-16 13:39:49
解答
原式=[(2m-3n)(2m+3n)]²
=[（2m)²-(3n)²]²
=[4m²-9n²]²
=16m^4-72m²n²+81n^4
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