Exercícios sobre expressões numéricas - 7º ano

1. Calcule o valor das expressões:

a) 25-[10+(7-4)] =
b) 32+[10-(9-4)+8] =
c) 45-[12-4+(2+1)] =
d) 70-{20-[10-(5-1)]} =
e) 28+{13-[6-(4+1)+2]-1} =
f) 53-{20-[30-(15-1+6)+2]} =
g) 62-{16-[7-(6-4)+1]} =
h) 20-{8+[3+(8-5)-1]+6} =
i) 15+{25-[2-(8-6)]+2} =
j) 56-[3+(8-2)+(51-10)-(7-2)] =
k){42+[(45-19)-(18-3)+1]-(28-15)-1} =

2. Calcule o valor da expressões:

a) 7-(1+3)=
b) 9-(5-1+2)=
c) 10-(2+5)+4=
d) (13-7)+8-1=
e) 15-(3+2)-6=
f) (10-4)-(9-8)+3=
g) 50-[37-(15-8)]=
h) 28+[50-(24-2)-10]=
i) 20+[13+(10-6)+4]=
j) 52-{12+[15-(8-4)]}=

3. Calcule o valor das expressões:

a) 25 + { 12 + [ 2 – ( 8 – 6 ) + 2 ]} = 39
b) { [ ( 18 – 3 ) + ( 7 + 5) – 2 ] + 5 } – 12 =
c) 65 – { 30 – [ 20 – ( 10 – 1 + 6) + 1 ]} =
d)45 + { 15 – [ ( 10 – 8 ) + ( 7 – 4) – 3 ] – 4 } =
e) 40 + { 50 – [35 – ( 25 +5) – 1 ]} + 7 =
f)38 – { 20 – [ 22 – ( 5 + 3) + ( 7 – 4 +1)]} =
g) 26 + { 12 – [ ( 30 – 18) + ( 4 – 1) – 6 ] – 1 } =