问题
解答题
因式分(1)x2-xy-12y2;
(2)a2-6a+9-b2
答案
(1)x2-xy-12y2,
=(x+3y)(x-4y);
(2)a2-6a+9-b2,
=(a-3)2-b2,
=(a-3+b)(a-3-b).
因式分(1)x2-xy-12y2;
(2)a2-6a+9-b2
(1)x2-xy-12y2,
=(x+3y)(x-4y);
(2)a2-6a+9-b2,
=(a-3)2-b2,
=(a-3+b)(a-3-b).