Question

(x+1)+(x+2)+(x+3)+...+(x+100)=205550

giúp nha

 

Answer 1

( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) = 205550

( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 100 ) = 205550

 100 x                 + 5050                                = 205550

  100 x                                                           =200500

        x                                                            = 2005

Answer 2

 (x+x+...+x) + (1+2+3+...+100) = 205550 
 100x + [100.(100+1) : 2] = 205550 
 100x + 5050 = 205550 
 100x = 200500 

 x= 2005 
Vậy x=2005