1- calcule o valor das expressões:
a)10-1+8-4
b)12-8+9-3
c)25-1-4-7
d)45-18+3+1-2
e)75-10-8+5-1
f)10+5-6-3-3+1
2 - resolva as expressões com parênteses
a)30-(2+8)-7
b)15+(8+2)
c)25-(10-1-3)
d)23-(2+8)-7
e) (10+5)-(1+6)
f)7-(8-3)+1
3- resolva as expressões com parênteses colchetes e chaves
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}
Soluções para a tarefa
1.a) 10-1+8-4
9 + 4
13
b) 12-8+9-3
4 + 6
10
c) 25-1-4-7
13
d) 45-18+3+1-2
27+2
29
e)75-10-8+5-1
55 +4
59
f)10+5-6-3-3+1
4
2. a)30-(2+8)-7
30-10-7
13
b)15+(8+2)
15+10
25
c)25-(10-1-3)
25 - 6
19
d)23-(2+8)-7
23-10-7
6
e) (10+5)-(1+6)
15 - 7
8
f)7-(8-3)+1
7 - 5 + 1
3
3 . a)25-{10+(7-4)]
25-[10+3]
25-13
12
b)32+[10-(9-4)+8]
32+[10-5+8]
32+[5+8]
32+13
45
c)45-[12-4+(2+1)]
45-[12-4+3]
45-5
40
d)70-{20-[10-(5-1)] }
70-{20-[10-6] }
70-{20-4 }
70-16
54
e)28+{13-[6-(4+1)+2]-1}
28+{13-[6-5+2]-1}
28+{13-1-1}
28+11
39
f)53-{20-[30-(15-1+6)+2] }
53-{20-[30-20+2] }
53-{20-12] }
53-8
45
g)62-{16-[7-(6-4)+1] }
62-{16-[7-2+1] }
62-{16-4 }
62-12
50
h)20- {8+[3+(8-5)-1]+6}
20- {8+[3+3-1]+6}
20- {8+5+6}
20- 19
1
i)15+{25-[2(-8-6)]+2}
15+{25-[2-14]+2}
15+{25-12+2}
15+15
30