Question

Calculați: [(8+8:8):9+(9+9:9):10-1]-1.

Answer 1

: sign means ratio
ration can said divide mark
[(8+8:8):9+(9+9:9):10-1]-1
[(8+1):9+(9+1):10-1]-1
[(9:9)+(10:10)-1]-1
[1+1-1]-1
1-1
0