题目内容
将下列各式因式分
(1)a5b-ab5;
(2)x2-x-6;
(3)a2-2a(b+c)+(b+c)2.
(1)a5b-ab5;
(2)x2-x-6;
(3)a2-2a(b+c)+(b+c)2.
(1)a5b-ab5,
=ab(a4-b4),
=ab(a2+b2)(a2-b2),
=ab(a2+b2)(a+b)(a-b);
(2)x2-x-6=(x-3)(x+2);
(3)a2-2a(b+c)+(b+c)2=(a-b-c)2.
=ab(a4-b4),
=ab(a2+b2)(a2-b2),
=ab(a2+b2)(a+b)(a-b);
(2)x2-x-6=(x-3)(x+2);
(3)a2-2a(b+c)+(b+c)2=(a-b-c)2.
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