Question

Tìm X, biết:

X + (X + 1) + (X + 2) + (X + 3) + ...+ (X + 19) = 950

Answer 1

=>20x+190=950

=>20x=760

hay x=38

Answer 2

`20x+190=950`

`20x=760`

`x= 760: 20`

`x= 38`

 

Answer 3

20 x X = 950 - (1 + 2 + 3 + 4 + 5 + ... + 19)

20 x X = 950 - 190

20 x X = 760

X = 760 : 20

X = 38

Answer 4

`=> 20x + ( 1 + ... + 19) = 950`

`=> 20x + 190 = 950`

`=> 20x = 760`

`=> x = 38`.

Answer 5