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3a7+1a+a4a=693


Răspuns :

307+10a+10+a+101a+40=693
357+112a=693
112a=336
a=3

100 × 3 + 10 × a + 1 × 7  + 10 × 1 +1 × a + 100 × a + 10 × 4 + 1× × a = 693

10 × a  + a  + 100 × a + a = 693 - (300 + 7 + 10 + 40)

112 × a = 693 - 357

112 × a = 336

=>
 
a = 336 ÷ 112

a = 3

Verificare:

337 + 13 + 343 = 350 + 343 = 693