Question

因式分解，要过程。。。。

Answer 1

3( a + 2 )" - 2( a + 2 )
= ( a + 2 )[ 3( a + 2 ) - 2 ]
= ( a + 2 )( 3a + 6 - 2 )
= ( a + 2 )( 3a + 4 )

15( a - b )" - 3( b - a )
= 15( a - b )" + 3( a - b )
= 3( a - b )[ 5( a - b ) + 1 ]
= 3( a - b )( 5a - 5b + 1 )

( a - 3 )" - ( 2a - 6 )
= ( a - 3 )" - 2( a - 3 )
= ( a - 3 )( a - 3 - 2 )
= ( a - 3 )( a - 5 )

-20a - 15ax
= ( -5a )( 4 + 3x )
= ( -5a )( 3x + 4 )

( m + n )( p - q ) - ( m + n )( q + p )
= ( m + n )[ ( p - q ) - ( p + q ) ]
= ( m + n )( p - q - p - q )
= ( -2q )( m + n )