Question

Tìm x biết: 

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

Answer 1

=> 100x+[(100+1).100:2]=5750

=> 100x+10100:2=5750

=> 100x=5750-5050

=> x=700:100

=> x=7

Answer 2

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

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

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

(x.100)+5050=5750

x.100=5750-5050

x.100=700

x       =700:100

x       = 7

Vậy x=7

Answer 3

x+1+X+2+X+3+...+X+100=5750

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

100.x +5550=5750

100.x =200

x=2

Answer 4

Ta có: ( x+1) + (x+2) + (x+3) +...+ ( x+100) = 5750

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

<=> 100x + 5050 = 5750

=> 100x = 5750 - 5050

=> 100x = 700

=> x = 700 : 100

=> x = 7