(3a-4b)(7a-8b)+(11a+2b)(8b-7a)的解题过程

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(3a-4b)(7a-8b)+(11a+2b)(8b-7a)的解题过程
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(3a-4b)(7a-8b)+(11a+2b)(8b-7a)的解题过程
(3a-4b)(7a-8b)+(11a+2b)(8b-7a)的解题过程

(3a-4b)(7a-8b)+(11a+2b)(8b-7a)的解题过程
(3a+4b)(7a-8b)+(11a+2b)(8b-7a)
=(3a+4b)(7a-8b)-(11a+2b)(7a-8b)
=(7a-8b)(3a+4b-11a-2b)
=(7a-8b)(2b-8a)

(3a-4b)(7a-8b)+(11a+2b)(8b-7a)
=21a^2-52ab+32b^2-77a^2+74ab+16b^2
=-56a^2+22ab+48b^2