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PRELIMINARES

Valor numérico de expresiones simples

Ejercicio 11

En el siguiente grupo de
ejercicios se reemplaza cada letra por su respectivo valor numérico, y
se realizan las operaciones indicadas

Hallar el valor numérico de las expresiones siguientes para a =1, b =2, c = 3, m =

1

2

, n =

1

3

, p =

1

4

3ab=3(
1
)
(
2
)
=6
5

a

2

b

3

c=5(1

)

2

(2

)

3

(
3
)
=5(
1
)
(
8
)
(
3
)
=120
b

2

mn=(2

)

2

(

1

2

)
(

1

3

)
=(

1

)
=

2

3
24

m

2

n

3

p=24

(

1

2

)
2

(

1

3

)
3

(

1

4

)
=(

1

)

(

1

)
(

1

)
=

1

18
2

3

a

4

b

2

m

3

=

2

3

(
1
)
4

(
2
)
2

(

1

2

)
3

=

2

3

(
1
)
(
)
(

1

)
=

1

3
7

12

c

3

p

2

m=

7

12

(
3
)
3

(

1

4

)
2

(

1

2

)
=

7

(
)
(

1

16

)
(

1

2

)
=

63

128
m

b

n

c

p

a

=

(

1

2

)
2

(

1

3

)
3

(

1

4

)
1

=(

1

4

)
(

1

27

)
(

1

4

)
=

1

432
5

6

a

b–1

m

c–2

=

5

6

(

1

2

)
(
3–2

)
=

5

6

(

1

2

)
=

5

12
2b

c

2

=

2(
2
)
(3

)

2

=

2

2

2

3

2

2

=2 × 3=6
4m

12b

c

2

3
=(

1

)

12(
2
)
(3

)

2

3
=2

(2

)

2

(
3
)
(
2
)
(3

)

2

3
=2

(2

)

3

(3

)

3

3

=2 × 2 × 3=12
mn

8

a

4

b

3

=(

1

2

)
(

1

3

)

(2

)

3

(1

)

4

(2

)

3

=

1

6

2

2

=

1

× =

4

3
4a

3bc

=

(
1
)

3(
2

)
(
3
)
=

2

9
5

b

2

m

2

np

=

5(2

)

2

(

1

2

)
2

(

1

3

)
(

1

4

)
=

5

(2

)

2

(

1

2

2

)

1

12

=

5

1

12

=5 × 12=60
3

4

b

3

2

3

c

2

=

3

4

(2

)

3

2

3

(3

)

2

=

3

2

2

2

3

(3

)

2

=

6

6

=1
2m

n

2

=

2
(

1

2

)

(

1

3

)

2

=

1

1

3

=3
24mn

2

n

2

p

2

=

(

1

2

)
(

1

3

)

2

(

1

3

)

2

(

1

4

)

2

=

2

1

12

=24
3

64

b

3

c

6

3

2m

=

3

(4

)

3

(2

)

3

(3

)

3

2
(

1

2

)
=3(
4
)
(
2
)
(
9
)
=216
3

5

ap

b

2

3

2

125bm
3

=

3

5

(
1
)
(

1

4

)

2

2

3

2

(5

)

3

(
2

)
(

1

2

)
3

=

3

5

3

2

(
5
)
=

2

25