Question

(234 + 124)а + 237с
562c + 634c +76с
569b + (69 +77)d
(645 + 567 + 867)c - 659а
a = 3
b = 2
C = 4
d = 5​​

Answer 1

$a=3,\;b=2,\;c=4,\;d=5\\\\\\(234+124)a+237c=358a+237c=358\cdot3+237\cdot4=1074+948=2022\\\\562c+634c+76c=(562+634+76)c=1272c=1272\cdot4=5088\\\\569b+(69+77)d=569b+146d=569\cdot2+146\cdot5=1138+730=1868\\\\(645+567+867)c-659a=2079c-659a=2079\cdot4-659\cdot3=\\=8316-1977=6339$