10分Factorization~help

我估你>係代表次方啦, 不過多數人都會用 ^ 黎表示次方既
1.
x^3 - 12y^3 - 4( x^2 )( y^2 ) + 3xy
=x^2 ( x - 4y^2 ) + 3y ( x - 4y^2 )
= ( x - 4y^2 )( x^2 + 3y )

2.
-p^3( 2x - y )^2 + 4p^3( x + 3y )^2
=p^3 [ 4( x + 3y )^2 - ( 2x - y )^2 ]
=p^3 ( 4x^2 + 24xy + 36y^2 - 4x^2 + 4xy - y^2 )
=p^3 ( 35y^2 + 28xy )
=7 p^3 y ( 4x + 5y )