Verified answer

3а+8а=1,87

11а=1,87

а=1,87:11

а=0,17

7z-3z=5.12

4z=5.12

z=5,12:4

z=1,28

Verified answer

3а+8а=1,87

11а=1,87

а=1,87:11

а=0,17

проверка:

3*0,17+8*0,17=1,87

0,51+1,36=1,87

1,87=1,87

7z-3z=5,12

4z=5,12

z=1,28

проверка:

7*1,28-3*1,28=5,12

8,96-3,84=5,12

5,12=5,12