Question

(x+1)+(x+3)+(x+5)+....+(x+99)=5000

Tìm x

Answer 1

Ta có:

( x + 1 ) + ( x + 3 ) + ( x + 5 ) + .... + ( x + 99 ) = 5 000

=> x + 1 + x + 3 + x + 5 +.....+ x + 99 = 5 000

=> ( x + x + x +....+ x ) + ( 1 + 3 + 5 +.....+ 99 ) = 5 000

=> 50x + 2 500 = 5 000

=> x = ( 5 000 - 2 500 ) : 50

=> x = 50

Answer 2

50x + 2500 = 5000

50x = 5000 - 2500

50x = 2500

x = 2500 : 50 

x = 50

Answer 3

( x + 1 ) + ( x + 3 ) + ( x +5 ) + ... + ( x +99 ) = 5000

( x + x + x + ... + x ) + ( 1 + 3 + 5 + ... + 99 ) = 5000

x . 50 + 2500 = 5000

x . 50 = 5000 - 2500

x . 50 = 2500

x = 2500 : 50

x = 50

Answer 4

( x + 1 ) + ( x + 3 ) + ( x +5 ) + ... + ( x +99 ) = 5000

( x + x + x + ... + x ) + ( 1 + 3 + 5 + ... + 99 ) = 5000

x . 50 + 2500 = 5000

x . 50 = 5000 - 2500

x . 50 = 2500

x = 2500 : 50

x = 50 

Answer 5

Số x :

  ( 99 - 1 ) : 2 + 1 = 50 ( x )

x . 50 + ( 1 + 2 + 3 + 4 + ... + 99 ) = 5500

x . 50 + 2500 = 5500

x . 50 = 2500

x = 50