1)5 1/6 + x = 14 5/21
31/6 + x = 299/21
x = 299/21 - 31/6
x = 127/14 = 9 1/14
Ответ: 9 1/14.
2) y = 3 1/4 - 4 15/28
y = 13/4 - 127/28
y = - 9/7 = - 1 2/7
Ответ: - 1 2/7.
3)5 23/40 - p = 2 3/8
223/40 - p = 19/8
-p = 19/8 - 223/40
-p = - 16/5
p = 16/5 = 3 1/5 = 3.2
Ответ: 3.2.
4)q - 7 5/18= 12 9/10
q - 131/18 = 129/10
q = 129/10 + 131/18
q = 908/45 = 20 8/45
Ответ: 20 8/45.