问题
计算题
把下列各式分解因式:
(1)6a2b﹣9ab2+3ab;
(2)a3﹣6a2﹣7a;
(3)(x2+x)2﹣(x+1)2.
答案
解:(1)6a2b﹣9ab2+3ab
=3ab(2a﹣3b+1)
(2)a3﹣6a2﹣7a
=a(a2﹣6a﹣7)
=a(a﹣7)(a+1)
(3)(x2+x)2﹣(x+1)2
=(x2+x+x+1)(x2+x﹣x﹣1)
=(x2+2x+1)(x2﹣1)
=(x+1)2(x+1)(x﹣1)
=(x+1)3(x﹣1)