(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3

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(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3
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(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3
(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3

(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3
(3a+b)(3a-b)^3 - (a+5b)(b-3a)^3
=(3a+b)(3a-b)^3 + (a+5b)(3a-b)^3
=(3a-b)^3(3a+b+a+5b)
=(3a-b)^3(4a+6b)

x^3-y^3=(x-y)(x^2+xy+y^2)

如果是合并同类项的话,就是:
2(3a-b)^3(2a+3b)