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999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 MŨ 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
9867555555555555555555754983748888888888888888888884444444444444448988000000000000000000000000000000000000000000000000480.....27777777777777777777779999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
số chữ số 9 là
1+2+3+4+5+....+100=\(\frac{100\left(100+1\right)}{2}\)=5050(chữ số9)
Minh cũng ko biết đúng hay sai nữa, lâu lắm rồi mới làm dạng này
Ta có
Số hạng thứ nhất:9=9*1
Số hạng thứ hai:99=9*11
Số hạng thứ ba:999=9*111
Số hạng cuối:100 số 9*100 số 1
=>số số hạng: [(100số 1-1):10+1]*9=100chữ số 9
=> Tổng=9*(100số 1+1)*100chữ số 9:2=450chữ số 9*101chữ số 1=45450chữ số 9.
Đ s:45450 chữ số 9
có 182 số 9
vậy tổng là : 182 x 9 = 1638
k mk nha
mk đùa thôi
có 182 số 9
tổng là: 182x9=1638
Học tốt!!!
182 x 9 = 1638
765 chữ số 9 :>
mk chịu
mình đã cận, đếm cái này cận thêm rồi
có 725 số
vậy tổng là :
725 x 9 = 6525
k mk nha
670 Số 9
cái này khó hơn
9966699999966699999966699966669996699999996699666996699 9966999999996999999996666996699666699666996699666996699 9966699999999999999966666699996666699666996699666996699 9966666999999999999666666669966666699666996699666996699 9966666669999999966666666669966666699666996699666996699 9966666666699996666666666669966666699666996699666996666 9966666666669966666666666669966666699999996699999996699
hãy tìm tổng các chữ số 9 ??
= 6525 nha bn
1638 số
lé hết mắt :00
663 SỐ 9 nha bn
Co tất cả 7 dòng số 9 và dự 5 số 9.