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It's in Cyrillic. The official title is "Четиризначни математически таблици и формули".

• anon_tor_12345 5y ago
  googled Четиризначни because didn't recognize it as a russian word (it means four digit) and the first hit is that book https://www.book.store.bg/p35401/chetiriznachni-matematicheski-tablici-i-formuli-dimo-serafimov.html https://www.book.store.bg/p35401/chetiriznachni-matematiches...
  • lb1lf 5y ago
    Bulgarian is a distinct language using the Cyrillic alphabet (as is for instance Macedonian, Serbian and Ukrainian)
    • anon_tor_12345 5y ago
      wikipedia used to have this https://i.redd.it/5ibk260ssqa61.png https://i.redd.it/5ibk260ssqa61.png e.g. i understood the other two words in the title no problem. >Ukrainian i'm from moldova and i speak russian and understand ukrainian pretty easily. calling them distinct languages is true but it's pedantic - it's a very blurry line how mutually intelligible the two languages are.
      • lb1lf 5y ago
        -Similar story where I come from - Norwegian, Swedish and Danish are sufficiently similar that we can mostly understand each other without much effort, especially (my opinion) in writing - Danish pronunciation is far more challenging to grasp than Swedish, at least to my Norwegian ears.
  • Kelamir 5y ago
    It's not Russian language. Close, but it's not.