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(-2m-3n-p)(2m-3n-p)
人气:499 ℃ 时间:2020-06-13 16:33:55
解答
原式=-[2m+(3n+p)]·[2m-(3n+p)]
=-4m²+(3n+p)²
=9n²+p²+6np-4m²
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