已知b的绝对值=3,a=2,且b-a的绝对值=a-b,求代数式9a平方-大括号7*(a的平方-2/7b)-3(1/3a的平方-b)大括号-1/2=
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![已知b的绝对值=3,a=2,且b-a的绝对值=a-b,求代数式9a平方-大括号7*(a的平方-2/7b)-3(1/3a的平方-b)大括号-1/2=](/uploads/image/z/1021858-34-8.jpg?t=%E5%B7%B2%E7%9F%A5b%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%3D3%2Ca%3D2%2C%E4%B8%94b-a%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%3Da-b%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F9a%E5%B9%B3%E6%96%B9-%E5%A4%A7%E6%8B%AC%E5%8F%B77%2A%EF%BC%88a%E7%9A%84%E5%B9%B3%E6%96%B9-2%2F7b%EF%BC%89-3%EF%BC%881%2F3a%E7%9A%84%E5%B9%B3%E6%96%B9-b%EF%BC%89%E5%A4%A7%E6%8B%AC%E5%8F%B7-1%2F2%3D)
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