将多项式(3a-4b)(7a-8b)-(11a-12b)(8b-7b)因式分解
(3a-4b)(7a-8b)-(11a-12b)(8b-7a)
=(7a-8b)(3a-4b+11a-12b)
=(7a-8b)(14a-16b)
=2(7a-8b)^2