Question

Tìm x, biết:

( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 1000 ) = 5750

Answer 1

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

HỌC TỐT

Answer 2

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

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

=> 100x + 5050 = 5750

=> 100x = 5750 - 5050

=> 100x = 700

=> x = 700 : 100

=> x = 7 

chúc hok tốt!!! ^_^

Answer 3

( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 1000 ) = 5750

x + 1 + x + 2 + x + 3 + ... + x + 1000 = 5750

( x + x + x +...+x) + ( 1+2+3+...+1000)=5750

100x + 5050 = 5750

100x = 5750 - 5050

100x = 700

       x=700:100

      x=7

Vậy x=7  

Answer 4

(x+1)+(x+2)+(x+3)+...+(x+1000)=5750

1000x + 500500 = 5750

1000x = -494750

x = -494.75

Vậy ...

Answer 5

(x+1)+(x+2)+(x+3)+....+(x+1000)=5750

<=> (x+x+x+....+x)+(1+2+3+....+1000)=5750

<=> 1000x+\(\frac{\left(1000+1\right)1000}{2}=5750\)

<=> 1000x+500500=5750

<=> 1000x=-494750

<=> x=-494,75

Answer 6

( x + 1 ) + (x + 2) + ( x + 3 ) + ... + ( x + 1000 ) = 5750

=>1000x + 500500 = 5750

=>1000x = -494750

=>x= -494750