Question

3405+489•4-4078
7200-315•3+526

Answer 1

$489 \times 4 = 1956$
$3405 + 1956 = 5361$
$5361 - 4078 = 1283$
второй пример

$- 315 \times 3 = - 945$
$7200 - 945 = 6255$
$6255 + 526 = 6781$