(m+2n)(m-3n)

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(m+2n)(m-3n)(m+2n)(m-3n)(m+2n)(m-3n)(m+2n)(m-3n)=m²-3mn+2mn-6n²=m²-mn-6n²m平方-mn-

(m+2n)(m-3n)
(m+2n)(m-3n)

(m+2n)(m-3n)
(m+2n)(m-3n)
=m²-3mn+2mn-6n²
=m²-mn-6n²

m平方-mn-6n平方