1+1+2+2+3+3..........................................................................................................+100000000+100000000=?
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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
Xét tổng trên có
(100000000-1):1+1=100000000
\(\Rightarrow\)Tổng trên
(1000000000+1)x100000000:2
=100000001x50000000
=5000000050000000
5+5+8+0+6+4+5+2+4+1+1+2+3+4+5+6+6+7+8+9+100000000+45638+78536 x 12345 x 34 x 0 +100=100045829
CHÚC BẠN HỌC GIỎI
TK MÌNH NHÉ
Dạ, cảm ơn anh, nhưng đây kg phải là đáp án của em. TRẻ con còn biết, mà người lại kg .Anh đừng tự tin, nhanh rồi cũng có lúc sai!!!
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