问题
解答题
分解因式:
(1)a2-4;
(2)a2-6a+9;
(3)1+4a+4a2;
(4)x4-y4.
答案
(1)原式=(a+2)(a-2);
(2)原式=(a-3)2;
(3)原式=(2a+1)2;
(4)原式=(x2+y2)(x2-y2)=(x2+y2)(x+y)(x-y).
分解因式:
(1)a2-4;
(2)a2-6a+9;
(3)1+4a+4a2;
(4)x4-y4.
(1)原式=(a+2)(a-2);
(2)原式=(a-3)2;
(3)原式=(2a+1)2;
(4)原式=(x2+y2)(x2-y2)=(x2+y2)(x+y)(x-y).