Question

tinh tong day so 1;2;3;4...999;1000

Answer 1

(1000-1):1+1=1000

(1+1000).1000:2=500500

Answer 2

tong cua mot nhom la 1000+1=1001

co so nhom la 1000/2=500

tong day so la 1001*500=5005000

Answer 3

SSH: (1000-1):1+1=1000

Tổng dãy số: (1000+1)*1000/2=500500

vậy tổng dãy số là 500500