Ответ:
(m+3n(m-6mn-n²)=
=m²-6m²n-mn²+3mn-18mn²-3n³=
=m² - 6m²n - 19mn² +3mn - 3n³.
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Ответ:
(m+3n(m-6mn-n²)=
=m²-6m²n-mn²+3mn-18mn²-3n³=
=m² - 6m²n - 19mn² +3mn - 3n³.