Sa ma ajute cineva urgent EX : 2

Răspuns:
12500-a=3642
a=12500-3642
a=8850
V:12500-8850=3642
b+421000=509210
b=509210-421000
b= 88120
V:88120+421000=509210
c+(28+16-9) =300
c+(46-9) =300
c+37=300
c=300-37
c=263
48-12+b=1904
36+b=1904
b=1904-36
b=1868