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(m-5n)(m-n)-6(m+2n)(m-3n)
人气:385 ℃ 时间:2020-06-04 18:07:22
解答
(m-5n)(m-n)-6(m+2n)(m-3n)
=m²-6mn+5n²-6(m²-3mn+2mn-6n²)
=m²-6mn+5n²-6m²+6mn+36n²
=-5m²+41n²
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