1) 10 9/16 - (3 11/12 + 4 4/9) 2) (20 - 7 23/36) - (14 4/27 - 6 1/18)

1) 10 9/16 = (10 * 16 + 9)/16 = 169/16;

3 11/12 = (3 * 12 + 11)/12 = 47/12;

4 4/9 = (4 * 9 + 4)/9 = 40/9;

47/12 + 40/9 = 141/36 + 160/36 = (141 + 160)/36 = 301/36;

169/16 - 301/36 = 1521/144 - 1204/144 = (1521 - 1204)/144 = 317/144.

Ответ: 317/144.

2) 7 23/36 = (7 * 36 + 23)/36 = 275/36;

20 - 275/36 = 720/36 - 275/36 = 445/36;

14 4/27 = (14 * 27 + 4)/27 = 382/27;

6 1/18 = (6 * 18 + 1)/18 = 109/18;

382/27 - 109/18 = 764/54 - 327/54 = 437/54;

445/36 - 437/54 = 1335/108 - 874/108 = 461/108.

Ответ: 461/108.