题目内容
1、计算6(7+1)(72+1)(74+1)(78+1)+1的值
分析:在本题中可把6看成是(7-1),再根据平方差公式一步步得出结果.
解答:解:6(7+1)(72+1)(74+1)(78+1)+1,
=(7-1)(7+1)(72+1)(74+1)(78+1)+1,
=(72-1)(72+1)(74+1)(78+1)+1,
=(74-1)(74+1)(78+1)+1,
=(78-1)(78+1)+1,
=(716-1)+1,
=716.
=(7-1)(7+1)(72+1)(74+1)(78+1)+1,
=(72-1)(72+1)(74+1)(78+1)+1,
=(74-1)(74+1)(78+1)+1,
=(78-1)(78+1)+1,
=(716-1)+1,
=716.
点评:本题中把6看成(7-1),再根据平方差公式一步步计算得出结果,难度适中.
练习册系列答案
相关题目