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用完全平方公式计算(2m+3n)²-(2m-3n)²
人气:419 ℃ 时间:2020-03-23 10:16:30
解答
(2m+3n)²-(2m-3n)²=[(2m+3n)+(2m-3n)]*[2m+3n)-(2m-3n)]=4m*6n=24mn
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