问题
解答题
(1)化简:(a+2b)(a-2b)-
(2)分解因式:-x3-2x2-x. |
答案
(1)(a+2b)(a-2b)-
b(a-8b),1 2
=a2-4b2-
ab+4b2,1 2
=a2-
ab;1 2
(2)-x3-2x2-x,
=-x(x2+x+1),
=-x(x+1)2.
(1)化简:(a+2b)(a-2b)-
(2)分解因式:-x3-2x2-x. |
(1)(a+2b)(a-2b)-
b(a-8b),1 2
=a2-4b2-
ab+4b2,1 2
=a2-
ab;1 2
(2)-x3-2x2-x,
=-x(x2+x+1),
=-x(x+1)2.