问题
解答题
因式分
(1)3a2-27;
(2) 3m2n-12mn+12n.
答案
(1)3a2-27,
=3(a2-9),
=3(a+3)(a-3);
(2)3m2n-12mn+12n,
=3n(m2-4m+4),
=3n(m-2)2.
因式分
(1)3a2-27;
(2) 3m2n-12mn+12n.
(1)3a2-27,
=3(a2-9),
=3(a+3)(a-3);
(2)3m2n-12mn+12n,
=3n(m2-4m+4),
=3n(m-2)2.