Question

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

ai lam nhanh to tich cho 

Answer 1

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

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

=> 100x              + 5050  = 5750

=> 100x                        = 5750 - 5050 = 700

=> x                              = 700:100

=> x                               = 7

Vậy x = 7

Answer 2

(x+1)+(x+2)+(x+3)+...+(x+100)=5750 
x + 1 + x + 2 + x + 3 + .... + x + 100 = 5750 
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 100) = 5750 
100x + 5050 = 5750 
100x = 5750 - 5050 = 700 
x = 700 : 100 = 7

Answer 3

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

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

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

                                  100x + 5050 = 5750

                                               100x = 5750 - 5050

                                                100x = 700

                                                      x = 7

Answer 4

[x+1] + [x+2] + [x+3] + ........+ [x+100] = 5750

<=>100x +(1+2+3+4+....+100)=5750

<=>100x + (1+100)x50 =5750

<=> 100x + 101x50=5750

<=>100x+5050 = 5750

=>100x= 5750 - 5050

=>100x= 700

=>x=700:100

=>x=7

Bài viết tham gia Hoa điểm 10 2016 

Answer 5

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

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

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

<=>      \(100x+\frac{\left(1+100\right).100}{2}=5750\)

<=>       100x + 5050 = 5750

<=>        100x            = 5750 - 5050 = 700

<=>         x = 700 : 100 = 7