Question

[Fuong Chic]

(x+1)+(x+2)+...+(x+98)+(x+99)=9900

Answer 1

[mai văn chương]

(x+1)+(x+2)+...+(x+98)+(x+99)=9900

x+x+x+x+...x+(1+2+...+98+99)=9900

50x+2500=9900

=>50x=7400

vậy x=148