Question

1+2+3+......+x=500500

 

Answer 1

\(1+2+3+.....+x=500500\)

\(=>6+x=500500\)

\(=>x=500500-6\)

\(=>x=500494\)

Answer 2

(1+x) .x=500500 : 2

(1+x).x=10001001

x.(1+x)= 1000*1001

suy ra x = 1000

vậy x= 1000

Answer 3

(1+x) .x=500500 : 2

 

(1+x).x=10001001

 

x.(1+x)= 1000*1001

 

suy ra x = 1000

 

vậy x= 1000