[tex]518 + (3 \times 3 \times 9) = [/tex]
[tex]643 + (3 \times 2 \times 10) = [/tex]
[tex]731 - (2 \times 4 \times 9) = [/tex]
[tex]147 - (6 \times 1 \times 6) = [/tex]
[tex]b[/tex]
[tex]4 \times (5 - 2 + 3) + 3 \times (9 - 4 + 2) = [/tex]
[tex]3 \times (6 - 4 + 2) + 2 \times (8 - 5 + 3) = [/tex]
[tex](5 - 1 + 3) \times 6 + (8 - 2 - 3) \times 3 = [/tex]
​