(2m+3n)^2×(3n-2m)^2求计算。
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(2m+3n)²(2m-3n)²
=[(2m+3n)(2m-3n)]²
=[(2m)²-(3n)²]²
=(4m²-9n²)²
=(4m²)²携御-2×4m²×9n²+(9n²)²皮隐磨燃斗
=16m^4-72m²n²+81n^4
=[(2m+3n)(2m-3n)]²
=[(2m)²-(3n)²]²
=(4m²-9n²)²
=(4m²)²携御-2×4m²×9n²+(9n²)²皮隐磨燃斗
=16m^4-72m²n²+81n^4
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