Logaritmos Cepu

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Universidad Nacional Jorge Basadre Grohmann CEPU RAZONAMIENTO MATEMÁTICO PRACTICA 13: LOGARITMOS Hallar un número cuyo logaritmo de base 10. Si: log (ab2)=1 y log (a3b)= -1 2 ; es igual a -6 Hallar: “ab” 1 2 1 A) 2 B) C) D) E) 0 1 6 8 8 A) 10 B) C) 0.01 D) 5 10 E) 7 ab 10 2. Resolver: log 9 x 27 = 4 11. Calcular: 8 2 3 C) D) E) 1 A) 3 B) 1   1  1  1  P = log 1 −  + log 1 −  + log  1 −  + ... + log 1 −  3 3 8 

3. Calcular:

A) 2

P = 2 log 2 5 + 7 log 7 12 + 13 log13 18 A) 35 B) 30 C) 10 D) 5

E) 12

(

B) 4

3

B)

3

)

C) 20 o 5 D) 20 o -5 E) 10

log n log n log n x = 0 n

n D) n 3 E)

A)

n

2

B)

−10 x + 25

 E = log16  log 4 log  9

(

3

3

B)

) =1 E) 4 o 6

A) 3

B) 3

9. Resolver:

16. Si:

8

(log 2) )  2

(1000 ) log x = x x 2

D)

4

2

E) 2

6 − 6 − 6 −. . .

D)

1 9

log x 3 = x x C)

9

D)

4

E) 1

3

3

E) -3

8 + log 3 x



= 81

log 3 x

3

C) 8

3 8

D) 3

log 1 x

3

E) 3

− x− x

1 C) 2 4

A)

1 B) 0 2

log b a C)

1 D) 4 3

17. calcular:

8 3

=2

D) 16 E) 4

JESUCRISTO ES EL SEÑOR

a = 12 + 12 + 12 + . . . b = 64 64 64. . .

2

A) -4 B)

3

−7

b log  a

E) 9 x

Si a 3-x . b 5x = a x+5 . b3x A) log a B) log b

300 

E) -1

A) 20 B) 18 C) 30 D) 25 E) 50

Calcular:

1 8



 x 2 + y 2 = 425  log x + log y = 2

B) -4 C) ¼ D) -¼ E) 1

3 8

C)

D) -2

1 1 C) − 3 3

Si:

7. Calcular el valor de:

8. Resolver:

3

6

15. Hallar: x+y

A) 12 B) -4 C) 3 o 2 D) 4 o -5

A) 4

x x

14. Hallar “x”:

6. Resolver:

7 log x (x

C) -3



56 + 56 + 56 + . . .

En base: A) 3

5. Resolver en “x”:

A) n 2 B) n n C)

5

13. Calcular el logaritmo de:

log10 a 2 − 15a = 2 A) 20 B) 5



12. Resolver: A)

4. Hallar “a”:

4

C) a+b D)ab

E) 1

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