Răspuns:
b. 2143+b+53204=84201
Explicație pas cu pas:
b=84.201-2.143-53.204
b=28.854
verificare 2.143+28.854+53.204=84.201
3417-b+24515=26.515
b=26.515-3.417-24.515
b=1.417
verificare 3.417-1.417+24.515=26.515
(2.000+24.515=26.515)
4.195+b+43.219=49.824
b=49.824-4.195-43.219
b=2410
verificare: 4.195+2.410+43.219=49.824
d. b+1.475+23.412=71.315
b=71.315-1.475-23.412
b=46.428
verificare:46,428+1475+23.412=71.315
b-1.890-14.789=32.456
b=32.456+1.890+14.789
b=49.135
verificare:49.135-1.890-14.789=32.456
