Odpowiedź :
[tex]64 - 37 = (60 + 4) - (30 + 7) = 64 - 37 = 27 \\ 64 - 37 = (40 + 20 + 4) - (20 + 10 + 7) = 64 - 37 = 27[/tex]
[tex]51 - 26 = (50 + 1) - (20 + 6) = 51 - 26 = 25 \\ 51 - 26 = (40 + 10 + 1) - (10 + 10 + 6) = 51 - 26 = 25[/tex]
[tex]73 - 48 = (70 + 3) - (40 + 8) = 73 - 48 = 25 \\ 73 - 48 = (50 + 20 + 3) - (20 + 20 + 8) = 73 - 48 = 25[/tex]
[tex]41 - 29 = (40 + 1) - (20 +9 ) = 41 - 29 = 12 \\ 41 - 29 = (20 + 20 + 1) - (10 + 10 + 9) = 41 - 29 = 12[/tex]
[tex]54 - 47 = (50 + 4) - (40 +7 ) = 54 - 47 = 7 \\ 54 - 47 = (20 + 30 + 4) - (20 + 20 + 7) = 54 - 47 = 7[/tex]