Question

Tìm x biết

(x+1)+(x+2)+...+(x+100)=5750

Answer 1

Theo đề ta có:

(x+1)+(x+2)+...+(x+100)=x+1+x+2+x+3+x+4+....+x+100

=[(100-1):(2-1)+1]x + (1+2+3+....+100)

=100x + [(100-1):(2-1)+1](100+1):2

=100x + 5050 = 5750

=> 100x = 5750-5050=700

=> x = 700:100

=> x=7

Selfie chào buổi tối nè,chào mn.

Answer 2

(x+1)+(x+2)+...+(x+100)=5750

100x+(1+2+3+...+100)=5750

100x+5050=5750

100x=5750-5050

100x=200

x=200:100

x=2

Vậy: x=2