Verified answer

Resposta:

[tex]3 \times ((2 \times (4 + 1) - {2}^{2} ) = [/tex]

[tex]3 \times ((2 \times 5) - {2}^{2} ) = [/tex]

[tex]3 \times (10 - 4) = [/tex]

[tex]3 \times 6 = 18[/tex]

R=18