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WhichofthefolIowingcouldbetheunitsdigitof57n(57的n次方),wherenisapositiveintegerIndicateallsuchdigits.A0B1C2D4E4F5G6H7I8J9

题目详情
Which of the folIowing could be the units digit of 57n(57的n次方),where n is a positive integer
Indicate all such digits.
A 0
B 1
C 2
D 4
E 4
F 5
G 6
H 7
I 8
J 9
▼优质解答
答案和解析
单就个位数来说:
7^1=7
7^2=9
7^3=3
7^4=1
然后循环
所以,答案是:1,3,7,9.