(m-12)(m+3)+9m谁能帮我?

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(m-12)(m+3)+9m谁能帮我?
(m-12)(m+3)+9m
谁能帮我?

(m-12)(m+3)+9m谁能帮我?
(m-12)(m+3)+9m
=m^2-9m-36+9m
=m^2-36
此题结果应该不要变成积的形式吧.所以是m^2-36

(m+9)(m-9)

(m-12)(m+3)+9m
=m²-9m-36+9m
=m2-36
=(m+6)(m-6)

(m-12)(m+3)+9m=m²-9m-36+9m=m²-36=(m+6)(m-6)

(m-12)(m+3)+9m
=m²+3m-12m-36+9m
=m²-36

(m-12)(m+3)+9m=m²-9m-36+9m=m²-36=(m+6)(m-6)