a) [(18 + 3 . 2) : 8 + 5 . 3] : 6 =

[( 18 + 6 ) : 8 + 15 ] : 6 =

[ 24 : 8 + 15 ] : 6 =

[ 3 + 15 ] : 6 =

18 : 6 = 3

b) 10 . [(7 . 4 - 2) + (5 . 3 - 4)] =

10 . [ ( 28 - 2 ) + ( 15 - 4 ) ] =

10 . [ 26 + 11 ] =

10 . 37 = 370

d) 54 : { 9 + [15 : 5 + (23 - 14)] - 15 } =

54 : { 9 + [ 3 + 9 ] - 15 } =

54 : { 9 + 12 - 15 } =

54 : { 21 - 15 } =

54 : 6 = 9

Verified answer

Calcule o valor numérico das expressões.

a) [(18 + 3•2) ÷ 8 + 5•3] ÷ 6 =

[tex]\qquad\large\boxed{\pink{\begin{array}{c}\rm{[(18+3\cdot 2)\div 8+5\cdot 3]\div 6=}\\\rm{[(18+6)\div 8+15]\div 6=}\\\rm{[24\div 8+15]\div 6=}\\\rm{[3+15]\div 6=}\\\rm{18\div 6=}\\\boxed{\bf{3}}\end{array}}}[/tex]

b) 10• [7•4 - 2] + (5•3 -4)] =

[tex]\qquad\large\boxed{\pink{\begin{array}{c}\rm{10\cdot [(7\cdot 4-2)+(5\cdot 3-4)]=}\\\rm{10\cdot [(28-2)+(15-4)]=}\\\rm{10\cdot [26+11]=}\\\rm{10\cdot 37=}\\\boxed{\bf{370}}\end{array}}}[/tex]

c) 54 ÷ {9 + [15 ÷ 5 + (23-14)] - 15} =

[tex]\qquad\large\boxed{\pink{\begin{array}{c}\rm{54\div \{ 9+[15\div 5+(23-14)]-15\}=}\\\rm{54\div \{9+[3+9]-15\}=}\\\rm{54\div \{9 +12-15\}=}\\\rm{54\div 6=}\\\\\boxed{\bf{9}}\end{array}}}[/tex]

[tex]\rule{7cm}{0.5mm}[/tex]

Bons estudos...!