<span>0, 1, 3, 12, 45, 171, 648, 2457, 9315, 35316, 133893, 507627, 1924560, 7296561, 27663363, 104879772, 397629405, 1507527531, 5715470808, ...
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A+(5+3),если a=40
a+(5+3)=a+8
Если a=40, то 40+8=48
Ответ:48
12х-16=15х+18+2
12х-15х=2+16+18
-3х=36/:(-3)
х=-12
А+б= 82 ~> 40+42
б+в= 85 ~> 42+43
а+в= 83 ~> 40+43
а+б+в= 40+42+43= 125