3a三次方-3ab²-21a²-21ab 因式分解
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3a三次方-3ab²-21a²-21ab 因式分解
3a三次方-3ab²-21a²-21ab
=3a(a^2-b^2)-21a(a+b)
=(a+b)(3a^2-3ab-21a)
=3a(a+b)(a-b-7)
3a三次方-3ab²-21a²-21ab 因式分解
3a三次方-3ab²-21a²-21ab
=3a(a^2-b^2)-21a(a+b)
=(a+b)(3a^2-3ab-21a)
=3a(a+b)(a-b-7)