100000000                     .

100000000           

10+100:10+100000000=10+10+100000000=10000000000

= 10 + 10 + 100000000

=100000020

= seven hundred million

mình đồng ý với bạn Mai Hồng Vân

100000000 + 100000000 = 200000000

= 200 000 000

Tích mik nhé -^^-

= 6000000000000000000000000000000000

400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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+10+100+1000+10000+100000+1000000+10000000+100000000

=(1+10)+(100+1000)+(10000+100000)+(10000000+100000000)

=11+1100+110000+110000000

=(11+1100)+(110000+110000000)

=1111+11110000

=11111111

toán lớp 5 đây à . sao khó thế  chắc cậu giỏi lắm nhỉ

không có số không tại bạn thêm số 1 rồi nên kết quả về sau toàn số 1 sau khi chia 2 thì có là:

555555555,5

không có số 0 nào vì chữ số liên tiếp bằng 1 rồi chia hai nên kết quả chỉ có các số 5 liên tiếp

có số nhóm là:(18-10):4=2

tổng : 2*2=4

nhớ giữ lời nha!

18 - 16 + 14  - 12 + 10 - 8 = ( 18 - 16 ) + ( 14 - 12 ) + ( 10 - 8 )

                                      = 2 + 2 + 2 

                                     = 6