若a满足a²-2a=3.求3a²-6a-8

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若a满足a²-2a=3.求3a²-6a-8
若a满足a²-2a=3.求3a²-6a-8

若a满足a²-2a=3.求3a²-6a-8
3a²-6a-8 = 3(a²-2a) - 8 =3x3-8=1

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