计算:(5+1)(52+1)(54+1)(58+1)(516+1)+14=______.
问题描述:
计算:(5+1)(52+1)(54+1)(58+1)(516+1)+
=______. 1 4
答
(5+1)(52+1)(54+1)(58+1)(516+1)+
,1 4
=
(5-1)(5+1)(52+1)(54+1)(58+1)(516+1)+1 4
,1 4
=
(532-1)+1 4
,1 4
=
.532 4
答案解析:本题是平方差公式的应用,把多项式:(5+1)(52+1)(54+1)(58+1)(516+1)+
转化为1 4
(5-1)(5+1)(52+1)(54+1)(58+1)(516+1)+1 4
=1 4
(532-1)+1 4
的形式,然后再利用平方差公式计算1 4
(516•2-1)+1 4
=1 4
.532 4
考试点:平方差公式.
知识点:本题考查了平方差公式的运用,添加
(5-1)项构造成平方差公式的形式是解题的关键,注意要连续多次运用公式.1 4