(3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!

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(3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!
(3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!
3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!

(3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)各位大神求解答过程!
(3a-4b)*(7a-8b­)+(11a+2b)*(8b-7a)
=(3a-4b)*(7a-8b­)-(11a+2b)*(7a-8b)
=(3a-4b-11a-2b)*(7a-8b­)
=(-8a-6b)*(7a-8b)
=-2(4a-3b)*(7a-8b­)