Resposta:

Explicação passo a passo:

A)[tex]\frac{5}{8} +\frac{3}{12} =\frac{15+6}{24} =\frac{21}{24}[/tex]

B) [tex]\frac{2}{5} *\frac{6}{3} *\frac{3}{4} =\frac{36}{60} =\frac{3}{5}[/tex]

C)

   √81 + {2.[3+4.(6-2)+(8+3).(5-2)]}

   9 + {2.[3+4.(4)+(11).(3)]}

   9 + {2.[3+16+33]}

   9 + {2.[52]}

   9 + {104}

   113

D)

    [tex]2^{3} +3^{2} .4^{2} +24 \div 2\\8+9*16+12\\8+144+12\\164[/tex]

E)

    [tex]\frac{2}{4} +2^{3} -\frac{1}{5} \\\\\frac{1}{2} +8+\frac{1}{5} \\\\\frac{5+80+2}{10} \\\\\frac{87}{10}[/tex]

F)

   [tex]\sqrt{49} -\sqrt{25} *2^{4} +5\\7-5*16+5\\7-80+5\\-68[/tex]