(1)m^2-n^2-n(m+n)(m-n)(2)9a^(m+1)-21a^m+7a^(m-1)(3)-4m^3+14m^2-6m越详细分越多(4)-49m^3yz^3+14m^2y^2z^2-21my^3z
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(1)m^2-n^2-n(m+n)(m-n)(2)9a^(m+1)-21a^m+7a^(m-1)(3)-4m^3+14m^2-6m越详细分越多(4)-49m^3yz^3+14m^2y^2z^2-21m
(1)m^2-n^2-n(m+n)(m-n)(2)9a^(m+1)-21a^m+7a^(m-1)(3)-4m^3+14m^2-6m越详细分越多(4)-49m^3yz^3+14m^2y^2z^2-21my^3z
(1)
m^2-n^2-n(m+n)(m-n)
(2)
9a^(m+1)-21a^m+7a^(m-1)
(3)
-4m^3+14m^2-6m
越详细分越多
(4)
-49m^3yz^3+14m^2y^2z^2-21my^3z
(1)m^2-n^2-n(m+n)(m-n)(2)9a^(m+1)-21a^m+7a^(m-1)(3)-4m^3+14m^2-6m越详细分越多(4)-49m^3yz^3+14m^2y^2z^2-21my^3z
m^2-n^2-n(m+n)(m-n)=(m+n)(m-n)-n(m+n)(m-n)=(m+n)(m-n)(1-n)
2.原式=a^(m-1)(9a^2-21a+7)
3.原式=-2m(2m^2-7m+3)=-2m(2m-1)(m-3)
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