Question

x + (x+1) + (x+2) + ..... + (x+30) =1240

Answer 1

Tham Khảo

Answer 2

tui lai hoi ne

 

 

Answer 3

Ta có: \(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\)

\(\Leftrightarrow31x+465=1240\)

hay x=25

Answer 4

Ta có: 

hay x=25

 chúc bn hok tốt!