1) у - 5/20 = 5/8 - 3/1y - 1/4 = 5/8 - 3/1y - 1/4 = 25/40 - 12/4y - 1/4 = 13/4y = 1/4 + 13/4y = 10/40 + 13/4y = 23/40
Ответ: у = 23/40
2) 2/3 - (7/9 - а) = 1/2/3 - 7/9 + а = 1/6/9 - 7/9 + а = 3/-1/9 + а = 3/а = 3/9 + 1/а = 4/9
Ответ: а = 4/9
1) у - 5/20 = 5/8 - 3/1
y - 1/4 = 5/8 - 3/1
y - 1/4 = 25/40 - 12/4
y - 1/4 = 13/4
y = 1/4 + 13/4
y = 10/40 + 13/4
y = 23/40
Ответ: у = 23/40
2) 2/3 - (7/9 - а) = 1/
2/3 - 7/9 + а = 1/
6/9 - 7/9 + а = 3/
-1/9 + а = 3/
а = 3/9 + 1/
а = 4/9
Ответ: а = 4/9