因式分解.3a ( a - 2 ) - ( 2 - a )

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因式分解.3a ( a - 2 ) - ( 2 - a )

因式分解.3a ( a - 2 ) - ( 2 - a )
因式分解.3a ( a - 2 ) - ( 2 - a )

因式分解.3a ( a - 2 ) - ( 2 - a )
原式
=3a ( a - 2 ) - ( 2 - a )
=3a ( a - 2 ) +( a - 2 )
=(3a+1)( a - 2 )

=3a²-6a-2+a
=3a²-5a-2
=(3a+1)(a-2)

3a ( a - 2 ) - ( 2 - a )
=3a ( a - 2 ) +( a - 2 )
=(3a+1)( a - 2 )