Ответ:
(m+2n)(m-n)= m²+mn-2n²
m²+2mn-mn-2n²= (3m+2n)(m-n)
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Ответ:
(m+2n)(m-n)= m²+mn-2n²
m²+2mn-mn-2n²= (3m+2n)(m-n)