(m+4n)(m-n)-6(m+2n)(m-3n)

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(m+4n)(m-n)-6(m+2n)(m-3n)
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(m+4n)(m-n)-6(m+2n)(m-3n)
(m+4n)(m-n)-6(m+2n)(m-3n)

(m+4n)(m-n)-6(m+2n)(m-3n)
这是要化简么...
原式=m^2+3mn-4n^2-6(m^2-mn-6n^2)
=-5m^2+9mn+32n^2