100000000                     .

100000000           

100000000

Câu này con thấy đc
1+1+2+2+3+3+....+100000000+100000000=2(1+2+3+...+100000000)=2x100000000x100000001:2=100000000x100000001

Ngu Người = Super crazy

1+1+2+2+3+3+...........+100000000+100000000=1+1+2+2+3+3+.........100000000+10000000.có đúng ko

100000000 + 100000000 = 200000000

= 200 000 000

Tích mik nhé -^^-

100 000 000+ 100 000 000= 200 000 000
 

= 6000000000000000000000000000000000

400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

đề là gì bạn 

Đặt A = 1+2+3+4+...+100000000 (có  100000000 số hạng)

      A = (1+100000000) x 100000000 : 2

      A =  100000001  x 100000000 : 2

      A =  10000001 x 50000000

      A =    5000000500000000

Vậy 1+2+3+4+...+100000000  =  5000000500000000

Đặt A = 1+2+3+4+...+100000000 (có  100000000 số hạng)

      A = (1+100000000) x 100000000 : 2

      A =  100000001  x 100000000 : 2

      A =  10000001 x 50000000

      A =    5000000500000000

Vậy 1+2+3+4+...+100000000  =  5000000500000000

từ 1 đến 100000000 có 100000000 số

tổng là:

100000000+1*100000000/2=5000000005000000

đ/s:5000000005000000

dài nhưng dễ

số số hạng là:

(100000000-1):1+1=100000000

tổng dãy số là:

\(\frac{100000000.\left(100000000+1\right)}{2}=5,0000005._{10^{^{14}}}\)

(100000000-1):1+1= bao nhiêu tự tính

1+2+3+4+5+6+7+8+9+....+100000000= bấm máy tính nha bạn