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a) 45 - {4 . [(9.12 - 14.7) : (15-5.2)]} =
45 - {4. [(108 - 98) : (15 - 10)]} =
45 - {4. [10 : 5]} =
45 - {4. 2} =
4 5 - {8} =
37
b) 20 : 4 + 3.2 - 15:3 =
5 + 6 - 5 =
11 - 5 =
6
c) [25 - (18 : 3) ] . {5 - [18 - (4.5 - 4)]} =
[25 - 6] . {5- [18 - (20-4)]} =
19 . {5- [18 - 16]} =
19 . {5- 2} =
19 . 3 =
57
d) {38 + [(143 : 11 + 7) - 5.2 ]} : 6 =
{38 + [143/11 + 7) - 10]} : 6 =
{38 + [20 - 10]} : 6 =
{38 + 10} : 6 =
48 : 6 =
8
e) 2. [(5-2).(3+2.7)]-2 =
2. [3 . (3+14)] - 2 =
2. [3. 17] - 2 =
2. 51 - 2 =
102 - 2 =
100
f) (8+6.8:4) + [3+15:5 +5] =
(8 + 6 . 2) + [3 + 3 + 5] =
(8 + 12) + 11 =
20 + 11 =
31
g) 25 : 5 + (8+3 .10:2) + (4.3 - 14:7) =
5 + (8 + 3 . 5) + (12 - 2) =
5 + (8 + 15) + 10 =
5 + 23 + 10 =
38
h) {[ 12 - 5.2 + (24:3 -7)] + 5} =
{[12 - 10 + (8-7)] + 5} =
{[2 + 1] + 5 } =
{3 + 5} =
8
i) (32 - 8:4)+ (45:9 + 8) - 6 =
(32 - 2) + (5 + 8) - 6 =
30 + 13 - 6 =
37
45 - {4. [(108 - 98) : (15 - 10)]} =
45 - {4. [10 : 5]} =
45 - {4. 2} =
4 5 - {8} =
37
b) 20 : 4 + 3.2 - 15:3 =
5 + 6 - 5 =
11 - 5 =
6
c) [25 - (18 : 3) ] . {5 - [18 - (4.5 - 4)]} =
[25 - 6] . {5- [18 - (20-4)]} =
19 . {5- [18 - 16]} =
19 . {5- 2} =
19 . 3 =
57
d) {38 + [(143 : 11 + 7) - 5.2 ]} : 6 =
{38 + [143/11 + 7) - 10]} : 6 =
{38 + [20 - 10]} : 6 =
{38 + 10} : 6 =
48 : 6 =
8
e) 2. [(5-2).(3+2.7)]-2 =
2. [3 . (3+14)] - 2 =
2. [3. 17] - 2 =
2. 51 - 2 =
102 - 2 =
100
f) (8+6.8:4) + [3+15:5 +5] =
(8 + 6 . 2) + [3 + 3 + 5] =
(8 + 12) + 11 =
20 + 11 =
31
g) 25 : 5 + (8+3 .10:2) + (4.3 - 14:7) =
5 + (8 + 3 . 5) + (12 - 2) =
5 + (8 + 15) + 10 =
5 + 23 + 10 =
38
h) {[ 12 - 5.2 + (24:3 -7)] + 5} =
{[12 - 10 + (8-7)] + 5} =
{[2 + 1] + 5 } =
{3 + 5} =
8
i) (32 - 8:4)+ (45:9 + 8) - 6 =
(32 - 2) + (5 + 8) - 6 =
30 + 13 - 6 =
37
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