Question

Tìm x biết

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

Answer 1

\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)

\(\Leftrightarrow\left(x+x+x+...+x\right)+\left(1+2+3+..+100\right)=5750\)

\(\Leftrightarrow100x+5050=5750\)

\(\Leftrightarrow100x=700\Rightarrow x=7\)

Vậy x =7 

Answer 2

=> x + 1 + x + 2 + x + 3 +...+ x + 100 = 5750 
=> (1 + 2 + 3 + ... + 100) + ( x + x + x + ... + x) = 5750 
=> 100x + 5050 = 5750 
=> 100x = 700 
=> x= 7 
Vậy x=7

Answer 3

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

=> x + 1 + x + 2 + x + 3 +...+ x + 100 = 5750
=> ﴾1 + 2 + 3 + ... + 100﴿ + ﴾ x + x + x + ... + x﴿ = 5750
=> 100x + 5050 = 5750
=> 100x = 700
=> x= 7
Vậy x=7

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Answer 4

1+2+3+4+....+100=5050

5750-5050=700

700:100=7 

Vậy x bằng 7

Answer 5

\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)

\(100x+\left(1+2+3+...+100\right)=5750\)

\(100x+5050=5750\)

\(100x=700\)

\(x=7\)

Vậy x = 7