(3a-4b)(7a-8b)-(11a-12b)(8b-7a)=(7a-8b)(3a-4b+11a-12b)
=5(14a-16b)=5*10=50
7a-8b=5,求(3a-4b)(7a-8b)-(11a-12b)(8b-7a)
7a-8b=5,求(3a-4b)(7a-8b)-(11a-12b)(8b-7a)
數(shù)學(xué)人氣：543 ℃時間：2020-04-15 08:25:59
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