Question

x+1/9=1; 1-x=5/9; X+2/7=1; 

Answer 1

x+1/9=1

х=1-1/9

х=8/9

 

Проверка:

8/9+1/9=9/9=1

 

1-х=5/9

х=1-5/9

х=4/9

 

Проверка:

1-4/9=9/9-4/9=5/9

 

х+2/7=1

х=1-2/7

х=5/7

 

Проверка:

5/7+2/7=7/7=1