因式分解 求详细过程 谢谢！
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- 9x"'y" - 6x"y" + 3xy
= - xy( 9x"y + 6xy - 3 )
= - 3xy( 3x"y + 2xy - 1 )
- ax" - (1/4)a + xa
= ( -a )( x" - x + 1/4 )
= ( -a )[ x" - 2(1/2)x + ( 1/2 )" ]
= ( -a )( x - 1/2 )"
x^4 - 2x"y" + y^4
= ( x" )" - 2(x")(y") + ( y" )"
= ( x" - y" )"
= ( x - y )"( x + y )"
= - xy( 9x"y + 6xy - 3 )
= - 3xy( 3x"y + 2xy - 1 )
- ax" - (1/4)a + xa
= ( -a )( x" - x + 1/4 )
= ( -a )[ x" - 2(1/2)x + ( 1/2 )" ]
= ( -a )( x - 1/2 )"
x^4 - 2x"y" + y^4
= ( x" )" - 2(x")(y") + ( y" )"
= ( x" - y" )"
= ( x - y )"( x + y )"
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