Question

100+200+300+...+1000=

AI K MINH MINH K LAI

Answer 1

mình nè

Answer 2

100+200+300+...+1000=(1000+100)X10/2=5500

AI K MINHH MINH K LAI NGUO DO

Answer 3

= 55000 nhé!

k  minh nha ^_-

Answer 4

(1000+100).10 :2 =5500