问题
解答题
因式分解
(1)4a2-9
(2)2x2-4x+2
(3)a3b-ab3
(4)a(x-1)-(1-x)
答案
(1)4a2-9=(2a+3)(2a-3);
(2)2x2-4x+2,
=2(x2-2x+1),
=2(x-1)2;
(3)a3b-ab3,
=ab(a2-b2),
=ab(a+b)(a-b);
(4)a(x-1)-(1-x),
=a(x-1)+(x-1),
=(x-1)(a+1).