Question

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

Answer 1

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

=> x+1+x+2+...+x+100=5750

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

Số các số x là : (100-1):1+1=100

=> Tong 1+2+...+100= 100 . (100+1):2=5050

=> 100x+5050=5750

=> 100x=700

=> x=7

Answer 2

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

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

100x + 100.101:2 = 5750

100x + 5050 = 5750

100x = 5750 - 5050 = 700

x = 700 : 100

x = 7