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.
因式分①m3-9m;②x2(x-y)-(x-y);③3a2-6a+3.
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.