已知(a+b)²=27,(a-b)²=3,求下列各式的值:(1)a²+b²;(2)ab若3²乘9^x乘27^x=9^6,试求x的值
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![已知(a+b)²=27,(a-b)²=3,求下列各式的值:(1)a²+b²;(2)ab若3²乘9^x乘27^x=9^6,试求x的值](/uploads/image/z/3676748-68-8.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88a%2Bb%29%26%23178%3B%3D27%2C%EF%BC%88a-b%29%26%23178%3B%3D3%2C%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC%EF%BC%9A%EF%BC%881%EF%BC%89a%26%23178%3B%2Bb%26%23178%3B%EF%BC%9B%EF%BC%882%EF%BC%89ab%E8%8B%A53%26%23178%3B%E4%B9%989%5Ex%E4%B9%9827%5Ex%3D9%5E6%2C%E8%AF%95%E6%B1%82x%E7%9A%84%E5%80%BC)
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