Răspuns:
[tex]8 \times 36 - 8 \times 27 = 288 - 216 = 72 \\ \\ 8 \times 9 = 72[/tex]
[tex]7 \times 27 - 7 \times 18 = 189 - 126 = 63 \\ \\ 7 \times 9 = 63[/tex]
[tex]6 \times 5 + 6 \times 7 = 30 + 42 = 72 \\ \\ 6 \times 12 = 72[/tex]
[tex]9 \times 4 + 9 \times 6 = 36 + 54 = 90 \\ \\ 9 \times 10 = 90[/tex]
