x"y - 2x" - y + 2
= x"( y - 2 ) - ( y - 2 )
= ( y - 2 )( x" - 1 )
= ( y - 2 )( x - 1 )( x + 1 )
4x( x - y )" - 12( x - y )"'
= 4( x - y )"[ x - 3( x - y ) ]
= 4( x - y )"( x - 3x + y )
= 4( x - y )"( -2x + y )
= -4( x - y )”( 2x - y )还有一道题，谢谢、-x"' + x" - (1/4)x麻烦帮忙解答一下，谢谢。-x( x - 1/2 )”-x( x" - x + 1/4 )
= -x[ x" - (2/2)x + (1/2)" ]
= -x( x - 1/2 )"或者
= -(1/4)x( 4x" - 4x + 1 )
= -(1/4)x[ (2x)" - 2(2x) + 1” ]
= -(1/4)x( 2x - 1 )"