х+2х=21.42...................................

Question

х+2х=21.42...................................

Answer 1

х+2х=21.42...

3==21,42

х=21,42/3

х=7, 14

проверка

7,14+2*7,14=21,72

7,14+14,28=21,72

21,72=21,72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 2

х+2х=21.42

3х=21,42

х=21,42:3

х=7,14