(3a-1)( )=1-6a+9a²
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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
(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