1. (5284 - 5035) • 16 + 28 • 309 = 12636
1) 5284 - 5035 = 249
2) 249 • 16 = 3984
3) 28 • 309 = 8652
4) 3984 + 8652 = 12636
2. 390 • 930 - 2800 • 145 : 100 = 358640
1) 390 • 930 = 362700
2) 2800 • 145 = 406000
3) 406000 : 100 = 4060
4) 362700 - 4060 = 358640