Question

решите уравнение:
1. 1/5+х=4/5
2. 13/17-у=3/17

Answer 1

1.
1/5 + х = 4/5,
х = 4/5 - 1/5,
х = 3/5,
проверка:
1/5 + 3/5 = 4/5,
4/5 = 4/5,

2.
13/17 - у = 3/17,
у = 13/17 - 3/17,
у = 10/17,
проверка:
13/17 - 10/17 = 3/17,
3/17 = 3/17