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若7a-8b=5.求(3a-4b)(7a-8b)-(11a-12b)(8b-7a)的值
人气:323 ℃ 时间:2020-03-15 14:55:25
解答
(3a-4b)(7a-8b)-(11a-12b)(8b-7a)
=(7a-8b)(3a-4b+11a-12b)
=(7a-8b)(14a-16b)
=2(7a-8b)²
=2×5²
=50
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