Question

TÌm x biết: (x+1)+(x+2)+(x+3)+...+(x+100)=5750

Answer 1

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

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

      100x          +  5050             =  5750

      100x                                  =  5750 - 5050

      100x                                  =   700

          x                                      = 700 : 100

          x                                        = 7

Answer 2

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

100 . x + 100 . 101 : 2

=> 100x + 101 + 50 = 5750

100x = 5750 - 5050 = 700

=> x = 700 : 100=7

=> x = 7

Answer 3

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

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

100x + 101 . 100 : 2 = 5750

100x + 5050 = 5750

100x = 700

x = 7

Answer 4

Cảm ơn mọi người.