Разберем каждый пример по порядку:
1. $$720 cdot 9 - 385 : 5 cdot (1029 - 980) =$$
$$6480 - 385 : 5 cdot 49 =$$
$$6480 - 77 cdot 49 =$$
$$6480 - 3773 =$$
2707
2. $$(811 + 4189) : 1000 cdot 317 - 600 =$$
$$5000 : 1000 cdot 317 - 600 =$$
$$5 cdot 317 - 600 =$$
$$1585 - 600 =$$
985
3. $$3100 : (67 cdot 28 - 592 cdot 3) + 2599 =$$
$$3100 : (1876 - 1776) + 2599 =$$
$$3100 : 100 + 2599 =$$
$$31 + 2599 =$$
2630
4. $$371 cdot 50 - 8 cdot (42 cdot 100 - 616 cdot 4) =$$
$$18550 - 8 cdot (4200 - 2464) =$$
$$18550 - 8 cdot 1736 =$$
$$18550 - 13888 =$$
4662
5. $$(95 cdot 63 - 94 cdot 56 + 279) : 1000 =$$
$$(5985 - 5264 + 279) : 1000 =$$
$$(721 + 279) : 1000 =$$
$$1000 : 1000 =$$
1
6. $$(53040 - 52584) cdot 90 + 58960 =$$
$$456 cdot 90 + 58960 =$$
$$41040 + 58960 =$$
100000