Notice that, for n⩾2, 2015n≡15n is congruent to 25( mod 100) when n is even and 75( mod 100) when n is odd. (Check for yourself). Since 2016 is even, 20152016≡25( mod 100) and 20152016−2017≡25−17≡08( mod 100). So the answer is (A)0. In a very simi...
What is the tens digit of ? A: B: C: D: E: 相关知识点: 试题来源: 解析 A Notice that, for , is congruent to mod when is even and mod when is odd. Check for yourself. Since is even, mod and mod . So the answer is . In a very similar fashion, we find that mod , whi...
百度试题 结果1 题目【题目】What is the tens digit of 72011? ( ). A.0 B.1 C.3 D.4E7 相关知识点: 试题来源: 解析 【解析】D 反馈 收藏
1What is the tens digit of positive integer x ?() (1)x divided by 100 has a remainder of 30. (2)x divided by 110 has a remainder of 30. A.条件(1)充分,但条件(2)不充分. B.条件(2)充分,但条件(1)不充分. C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分. D.条...
百度试题 结果1 题目What is the tens digit of 72011?( ). A. 0B. 1C. 3D. 4E. 7相关知识点: 试题来源: 解析 D 反馈 收藏
相关知识点: 试题来源: 解析 B 100000000=28×58, Like all powers of5⩾52,58 ends in”25”. 100000000的最大奇数的十位数字是( ). A.0 B.2 C.4 D.6 10000000=28×58,所有大于等于52的5的指数都以“25”结尾. 故选B.反馈 收藏
百度试题 结果1 题目What is the tens digit of 7^(2011)?( ). A. 0 B. 1 C. 3 D. 4 E. 7 相关知识点: 试题来源: 解析 D 反馈 收藏
The largest 4-digit even number usin g these digits exactly once each ends in an 8 and is 9758, The tens’ digit is 5. 用5,7,9,8来构成一个四位数,那么最大的4位数偶数的十位数字是( ). A. 9 B. 8 C.7 D. 5 最大的4位数偶数,一定要是以8结尾的,那么这个数9758,那么十位数字是5...
解析 D 7^(2011)的十位数字是几? 7的一次方,二次方,⋅ ⋅ ⋅ 是7,49,343,2401,16807.如你所见,最后两位数字在每4次方之后循环.71(mod 100)≡75(mod 100)≡72009(mod 100).从那里,我们再来两个次方.最后两位数字是43,所以十位数是4. 故选.反馈 收藏 ...
百度试题 结果1 题目What is the tens' digit of the product 2003×2004( ). A. 3B. 2C. 1D. 0相关知识点: 试题来源: 解析 C 反馈 收藏