Разложите на множители: а)xy+2y-2x-4 b)2cx-cy-6x+3y c)x^2+xy+xy^2+y^3

А) = ( xy + 2y ) - ( 2x + 4 ) = y * ( x + 2 ) - 2 * ( x + 2 ) = ( x + 2 ) * ( y - 2 ) ;
B) = ( 2cx - cy ) - ( 6x - 3y ) = c * ( 2x - y ) - 3 * ( 2x - y ) = ( 2x - y ) * ( c - 3 ) ;
C) = ( x^2 + XY ) + ( xy^2 + y^3 ) = x * ( x + y ) + y^2 * ( x + y ) = ( x + y ) * ( x + y^2 )