Ответы
1)
6 5/27 - (x - 1 2/9) = 3 20/81
x - 1 2/9 = 6 5/27 - 3 20/81
x - 1 2/9 = 6 15/81 - 3 20/81
x - 1 2/9 = 5 96/81 - 3 20/81
x - 1 2/9 = 2 76/81
x = 2 76/81 + 1 2/9
x = 2 76/81 + 1 18/81
x = 3 94/81
x = 4 13/81
Ответ: 4 13/81
2)
9 9/28 - (4 5/21 - x) = 6 2/7
4 5/21 - x = 9 9/28 - 6 2/7
4 5/21 - x = 9 9/28 - 6 8/28
4 5/21 - x = 3 1/28
x = 4 5/21 - 3 1/28
x = 4 140/588 - 3 21/588
x = 1 119/588
x = 1 17/84
Ответ: 1 17/84
3)
3 5/36 - (1 31/54 - x) = 1 17/27
1 31/54 - x = 3 5/36 - 1 17/27
1 31/54 - x = 339/108 - 176/108
1 31/54 - x = 163/108
1 31/54 - x = 1 55/108
x = 1 31/54 - 1 55/108
x = 1 62/108 - 1 55/108
x = 7/108
Ответ: 7/108
Ответ:
17. 1 17/84.
18. 7/108.
Объяснение:
17.
9 9/28 - (4 5/21 - x) = 6 2/7
9 9/28 - 4 5/21 + x = 6 2/7
х = 6 2/7 + 4 5/21 - 9 9/28
х = 6 24/84 + 4 20/84 - 9 27/84
х = 1 17/84
Ответ: 1 17/84.
18.
3 5/36 - (1 31/54 - х) = 1 17/27
3 5/36 - 1 31/54 + х = 1 17/27
3 15/108 - 1 62/108 + х = 1 68/108
х = 1 68/108 + 1 62/108 - 3 15/108
х = 3 22/108 - 3 15/108
х = 7/108
Ответ: 7/108.