Решение примеров:

а) 1635401 - (209*(141-308750:4750) + 4986)*23;

1. 308750 : 4750 = 65
2. 141 - 65 = 76
3. 209 * 76 = 15884
4. 15884 + 4986 = 20870
5. 20870 * 23 = 480010
6. 1635401 - 480010 = 1155391

Ответ: 1155391

б) ((273013:13 + 437*27):160 + 116):321;

1. 273013 : 13 = 21001
2. 437 * 27 = 11799
3. 21001 + 11799 = 32800
4. 32800 : 160 = 205
5. 205 + 116 = 321
6. 321 : 321 = 1

Ответ: 1

в) 10518 + (1845*267 + 62238:(39832-39326)):641;

1. 39832 - 39326 = 506
2. 62238 : 506 = 123
3. 1845 * 267 = 492615
4. 492615 + 123 = 492738
5. 492738 : 641 = 768.702...
6. 10518 + 768.702... = 11286.702...

Ответ: 11286.702...

г) ((63840 + 2767602:64567): 467 + 598*75):138

1. 2767602 : 64567 = 42.86...
2. 63840 + 42.86... = 63882.86...
3. 63882.86... : 467 = 136.79...
4. 598 * 75 = 44850
5. 136.79... + 44850 = 44986.79...
6. 44986.79... : 138 = 325.99...

Ответ: 325.99...