Решите уравнение 1)7/8x+3/4x-7=6 2 )2 6/7x-1 6/7-8=7

1) 7/8x + 3/4x - 7 = 6;

7/8х + 3/4х = 6 + 7;

7/8х + 6/8х = 13;

13/8х = 13;

х = 13 : 13/8;

х = 13 * 8/13;

х = 8.

Проверка:

7/8 * 8 + 3/4 * 8 - 7 = 6;

7 + 6 - 7 = 6;

6 = 6.

Ответ: х = 8.

2) 2 6/7x - 1 6/7 - 8 = 7;

20/7х - 13/7 - 8 = 7;

20/7х - 13/7 - 56/7 = 7;

20/7х - 69/7 = 7;

20/7х = 7 + 69/7;

20/7х = 49/7 + 69/7;

20/7х = 118/7;

х = 118/7 : 20/7;

х = 118/7 * 7/20;

х = 59/10 = 5 9/10.

Проверка:

20/7 * 59/10 - 13/7 - 8 = 7;

118/7 - 13/7 - 8 = 7;

105/7 - 8 = 7;

15 - 8 = 7;

7 = 7.

Ответ: 

х = 59/10 = 5 9/10.