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(m-2n)(2n+m)-(3m-4n)² 怎样化简?
人气:284 ℃ 时间:2020-06-07 13:17:20
解答
伸手能碰到天,
(m-2n)(2n+m)-(3m-4n)²
=m²-4n²-9m²-16n²+24mn
=-8m²-20n²+24mn
=-4(2m²-6mn+5n²)
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