1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )

1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )
2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )
3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )
4.m^2=3m+3n-n^2=( )-( )=( )( )
5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )
6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2*xy()()

1.m^2-nc+mn-mc=(m^2+mn)-(nc+mc )=(m-c )(m+n )
2.m^2-nc+mn-mc=(m^2-mc)-(nc-mn )=(m+n )( m-c)
3.9-x^2+2xy-y^2=9-(x^2-2xy+y^2 )=(3 )^2-( x-y)^2=( 3-x+y)(3+x-y )
4.m^2-3m+3n-n^2=( m^2-n^2)-( 3m-3n)=( m+n-3)( m-n)
5.x^2y-x^2z+y^2z-y^3=(x^2y-x^2z )-(y^3-y^2z )=(x^2-y^2)(y-z )=( x-y)( x+y)(y-z )

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