3m2n-12mn+12n.
问题描述:
3m2n-12mn+12n.
答
3m2n-12mn+12n,
=3n(m2-4m+4),
=3n(m-2)2.
3m2n-12mn+12n.
3m2n-12mn+12n,
=3n(m2-4m+4),
=3n(m-2)2.