问题 解答题

因式分①m3-9m;②x2(x-y)-(x-y);③3a2-6a+3.

答案

①m3-9m,

=m(m2-9),

=m(m+3)(m-3);

②x2(x-y)-(x-y),

=(x-y)(x2-1),

=(x-y)(x+1)(x-1);

③3a2-6a+3,

=3(a2-2a+1),

=3(a-1)2

单项选择题
单项选择题