(3a-1)( )=1-6a+9a²
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![(3a-1)( )=1-6a+9a²](/uploads/image/z/1979995-67-5.jpg?t=%283a-1%29%28+%29%3D1-6a%2B9a%26%23178%3B)
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(3a-1)( )=1-6a+9a²
(3a-1)( )=1-6a+9a²
(3a-1)( )=1-6a+9a²
(3a-1)( )=1-6a+9a²
(3a-1)( )=(3a-1)*(3a-1)
()=(3a-1)
应该是:3a-1
(3a-1)( 3a-1)=1-6a+9a²