3(m^2+mn)-4(mn-2m^2n)+mn
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3(m^2+mn)-4(mn-2m^2n)+mn3(m^2+mn)-4(mn-2m^2n)+mn3(m^2+mn)-4(mn-2m^2n)+mn3(m^2+mn)-4(mn-2m^2n)+mn=3m&
3(m^2+mn)-4(mn-2m^2n)+mn
3(m^2+mn)-4(mn-2m^2n)+mn
3(m^2+mn)-4(mn-2m^2n)+mn
3(m^2+mn)-4(mn-2m^2n)+mn
=3m²+3mn-4mn+2m²n+mn
=3m²+2m²n
=m²(3+2n)
3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程
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因式分解m^3-2m^2n+mn^2-4m^2+4mn+4m
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