直接写出因式分解的结果:
(1)x2-xy=______(2)x2-1=______;
(3)a2-6a+9______(4)a2-a-6=______.
(1)x2-xy=x(x-y);(2)x2-1=(x+1)(x-1);
(3)a2-6a+9=(x-3)2;(4)a2-a-6=(a-3)(a+2).
故答案为:(1)x(x-y);(2)(x+1)(x-1);(3)(x-3)2;(4)(a-3)(a+2)
直接写出因式分解的结果:
(1)x2-xy=______(2)x2-1=______;
(3)a2-6a+9______(4)a2-a-6=______.
(1)x2-xy=x(x-y);(2)x2-1=(x+1)(x-1);
(3)a2-6a+9=(x-3)2;(4)a2-a-6=(a-3)(a+2).
故答案为:(1)x(x-y);(2)(x+1)(x-1);(3)(x-3)2;(4)(a-3)(a+2)