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Ejercicios logaritmos 1º bachillerato-css
Ejercicios logaritmos 1º bachillerato-css
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Dec 22, 2010
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Dec 22, 2010
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Slide 1
EJERCICIOS DE LOGARITMOS
Ejercicio 1.- Halla el valor de x en las siguientes expresiones:
(a) 225log=
x
(b) 3216log =
x
(c)
2
1
4log=
x
(d) 2
1
4log-=
x
(e) 2
1
3log=
x
(f) 3343log
=
x
(g) 6
64
1
log -=
x
(h) 2
1
5log-=
x
(i)
2
100
1
log -=
x
(j) 2
5
32log=
x
(k) 481log
-=
x
(l) 249log=
x
Ejercicio 2.- Calcula el valor de las siguientes expresiones:
(a)
35
26
2
512·2
4·64
log (b)
3
3
27·81
729·27
log (c)
125
625·25
log
4
5
(d)
2401
343·49
log
3
7
Ejercicio 3.- Sabiendo que log 2
» 0,3 y que log 3 » 0,48 , calcula estos logaritmos
decimales.
(a)
log 4
(b)
log 5
(c)
log 6
(d)
log 8
(e)
log 12
(f)
log 15
(g)
log 18
(h)
log 24
(i)
log 25
(j)
log 30
(k)
log 36
(l)
log 40
(m)
log 45
(n)
log 60
(o)
log 72
(p)
log 75
Ejercicio 4.- Conociendo los valores de log 2 y log 3, halla los valores de las siguientes
expresiones:
(a)
log 14,4
(b)
log 0,048
(c)
log 2,88
(d)
log 0,015
(e)
log 3600
(f)
log
76,5
(g)
log
3
240
(h)
log
8,12
4,5
(i)
log
4,14
8,10
(j)
log 6,4·
4,2
(k)
log
32,0
25,1
(l)
log
6,1·2,3
(m)
log
8
025,0
(n)
log
4 3
53
80·0125,0
64,0·2,3
(o)
log 6561
1
(p)
5
5
12
log
(q)
log
3
5
9
(r)
log
4
25,781
Slide 2
Ejercicio 5.-
Resuelve las siguientes ecuaciones logarítmicas:
(a) ( ) 3log115log
2
1
43log
+=+++ xx
(b)
( ) 3125log2log95
2
=++-xx
(c) ( ) 416log5log74
2
=++-xx
(d)
2
log32loglog3
x
x
=-
(e)
1
2
loglog2-=
x
x
(f) 9
32
loglog3
3
log2
5
log5 -=+x
xx
(g)
10
log3log2
x
x
+=
(h)
( )216loglog2 =--xx
(i) ( ) ( )232log35log
32
=++- xx
(j) 5log132log13log -=--+ xx
(k)
( )
( )
2
5log
11log3log
3
=
-
-+
x
x
(l)
( ) ()04log328log
3
=--- xx
Ejercicio 6.- Resuelve los siguientes sistemas de ecuaciones logarítmicas:
(a)
=+
=+3loglog
70yx
yx
(b)
=-
=- 1loglog
11
22
yx
yx
(c)
=+
=-
7loglog
8
22
yx
yx
(d)
=+
=+ 6loglog
5log35loglog
33
yx
x
(e)
=+
=- 1loglog
7log3log2yx
yx
(f)
=
=+
3log
5log3log
2
y
x
yx
(g)
-=-
=+
2log2log2
3loglog
yx
yx
(h)
=-
=+
1loglog
22
yx
yx
(i)
( )
( )
=+
=-
2
1
3log
218log
x
y
y
x
(j)
() ()
=
=-++
+ 11
22
33logloglog
yx
yxyx
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