ta thấy cứ dãy là 142857142857142857.......
nên có tổng là 1+4+2+8+5+7=27
có số cặp là:
2017:5=403(cặp và 2 số thừa)
vậy tổng là:
403×27+1+4=10886
tk mình nha
trong violympic ko có đáp án như thế này?
Giải:
Ta có: Quy luật của dãy số là: 6 số 142857 lập lại liên tục. Suy ra: Tổng của 6 số này là: 1 + 4 + 2 + 8 + 5 + 7 = 27
Ta cũng có: 2017 : 6 = 336 (dư 1)
Suy ra: Tổng của 2017 chữ số đầu tiên sau dấu phẩy của thương trên là: 27 x 336 + 1 = 9073
9073 đấy dúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
Ủa còn mình thì chưa bao giờ gặp. Cô mình giao bài thôi
Ta thấy quy luật của dãy là 6 chữ số 1,4,2,8,,5,7. Vậy ta có số cặp là 2017:6=336 số (dư 1 số)
Tổng của một cặp là 1+4+2+8+5+7=27
Suy ra tổng là 336x27+1=9073
k cho mình nha!
