(3a-4b)(7a-8b)+(11a-12b)(8b-7a)

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(3a-4b)(7a-8b)+(11a-12b)(8b-7a)

(3a-4b)(7a-8b)+(11a-12b)(8b-7a)
(3a-4b)(7a-8b)+(11a-12b)(8b-7a)

(3a-4b)(7a-8b)+(11a-12b)(8b-7a)
(3a-4b)(7a-8b)+(11a-12b)(8b-7a)
=(3a-4b)(7a-8b)-(11a-12b)(7a-8b)
=(3a-4b-11a+12b)(7a-8b)
=(8b-8a)(7a-8b)
=8(b-a)(7a-8b)

(3a-4b)(7a-8b)+(11a-12b)(8b-7a)
=(7a-8b)*(3a-4b-11a+12b)
=(7a-8b)(-8a+8b)
=8(7a-8b)(b-a)

(3a-4b)(7a-8b)+(11a-12b)(8b-7a)
=(3a-4b)(7a-8b)-(7a-8b)(11a-12b)
=(7a-8b)(3a-4b-11a+12b)
=(7a-8b)(-8a+8b)
=8(7a-8b)(-a+b)

答案是
8(7a-8b)(b-8)
帮忙采纳 谢谢了