Respostas
8) 32 + [10 - (9 - 4) + 8]
32 + [10 - 5 + 8]
32 + [5 + 8]
32 + 13
45
9) 45 - [12 - 4 + (2 + 1)]
45 - [12 - 4 + 3]
45 - [8 + 3]
45 - 11
34
10) 70 - {20 - [10 - (5 - 1)]}
70 - {20 - [10 - 4]}
70 - {20 - 6}
70 - 14
56
11) 28 + {13 - [6 - (4 + 1) + 2] - 1}
28 + {13 - [6 - 5 + 2] - 1}
28 + {13 - [1 + 2] - 1}
28 + {13 - 3 - 1}
28 + { 10 - 1}
28 + 9
37
12) 53 - {20 - [30 - (15 - 1 + 6) + 2]}
53 - {20 - [30 - (14 + 6) + 2]}
53 - {20 - [30 - 20 + 2]}
53 - {20 - [10 + 2]
53 - {20 - 12}
53 - 8
45
13) 62 - {16 - [7 - (6 - 4) + 1]}
62 - {16 - [7 - 2 + 1]}
62 - {16 - [5 + 1]}
62 - {16 - 6}
62 - 10
52
14) 20 - {8 + [3 + (8 - 5) - 1] + 6}
20 - {8 + [3 + 3 - 1] + 6}
20 - {8 + [6 - 1] + 6}
20 - {8 + 5 + 6}
20 - {13 + 6}
20 - 19
1
15) 15 + {25 - [2 - (8 - 6)] + 2}
15 + {25 - [2 - 2] + 2}
15 + {25 - 0 + 2}
15 + {25 + 2}
15 + 27
42
Resposta:
8) 45
9) 34
10) 56
11) 37
12) 45
13) 52
14) 1
15) 42
Explicação passo-a-passo:
8) 32+(10-(9-4)+8)
32+(10-(9-4)+8)
32+(10-5+8)
10-5+8
18-5
13
32+(10-5+8)
32+13
45
9) 45-(12-4+(2+1))
45-(12-4+(2+1))
45-(12-4+3)
12-4+3
15-4
11
45-(12-4+3)
45-11
34
10) 70-(20-(10-(5-1)))
70-(20-(10-(5-1)))
70-(20-(10-4))
70-(20-6)
70-14
56
11) 28+(13-(6-(4+1)+2)-1)
28+(13-(6-(4+1)+2)-1)
28+(13-(6-5+2)-1
6-5+2
8-5
3
28+(13-(6-5+2)-1)
28+(13-3-1)
13-3-1
13-4
9
28+(13-3-1)
28+9
37
12) 53-(20(30-(15-1+6)+2))
53-(20-(30-(15-1+6)+2))
15-1+6
21-1
20
53-(20-(30-20+2))
30-20+2
32-20
12
53-(20-12)
53-8
45
13) 62-(16-(7-(6-4)+1))
62-(16-(7-(6-4)+1))
62-(16-(7-2+1))
7-2+1
8-2
6
62-(16-6)
62-10
52
14) 20-(8+(3+(8-5)-1)+6)
20-(8-+(3+(8-5)1)+6)
20-(8+(3+3-1)+6)
3+3-1
6-1
5
20-(8+5+6)
8+5+6
13+6
19
20(-8+5+6)
20-19
1
15) 15+(25-(2-(8-6))+2)
15+(25-(2-(8-6)+2
15+(25-(2-2)+2)
15+(25-0+2)
15+(25+2)
15+(25-0+2)
15+27
42