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

问题描述:

(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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