Răspuns :
(a+963:3)x13-(123+809)=12445
(a+321)x13-932=12445
13a+4173-932=12445
13a+3241=12445
13a=12445-3241
13a=9204
a=9204:13
a=708
(708+963:3)x13-(123+809)=12445
(a+321)x13-932=12445
13a+4173-932=12445
13a+3241=12445
13a=12445-3241
13a=9204
a=9204:13
a=708
(708+963:3)x13-(123+809)=12445
963 : 3 = 321
123 + 809 = 932
a + 321 = ? * 13= ?-932=12445
12445+932=13377
13377/13 = 1024
1024 - 321 = 703
123 + 809 = 932
a + 321 = ? * 13= ?-932=12445
12445+932=13377
13377/13 = 1024
1024 - 321 = 703