计算:(1)6(7+1)(72+1)(74+1)(78+1)+1;(2)1.345×0.345×2.69-1.3453-1.345×0.
答案:1 悬赏:30 手机版
解决时间 2021-01-26 13:21
- 提问者网友:無理詩人
- 2021-01-25 17:08
计算:(1)6(7+1)(72+1)(74+1)(78+1)+1;(2)1.345×0.345×2.69-1.3453-1.345×0.
最佳答案
- 五星知识达人网友:过活
- 2021-01-25 18:06
(1)6(7+1)(72+1)(74+1)(78+1)+1
=(7-1)(7+1)(72+1)(74+1)(78+1)+1
=716;
(2)设1.345=x,
则1.345×0.345×2.69-1.3453-1.345×0.3452
=x(x-1)?2x-x3-x(x-1)2=-x=-1.345.
=(7-1)(7+1)(72+1)(74+1)(78+1)+1
=716;
(2)设1.345=x,
则1.345×0.345×2.69-1.3453-1.345×0.3452
=x(x-1)?2x-x3-x(x-1)2=-x=-1.345.
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