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利用欧拉定理找一个0~9之间的数a,使得7^1000模10与a同余(注意这等于7^1000的十进制展开的最后一位) Euler' sTheorem: for every (a,n) that are relatively prime to Ø(n) is a conginent model. a ^Ø(n) =1 mod n This condition, a is between 0 to...