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Plog a = m artinya a = pm
Keterangan:
p disebut bilangan pokok
a disebut bilangan logaritma atau numerus
dengan a > 0
m disebut hasil logaritma atau eksponen dari
basis
 Pada bentuk plog a = m, maka: 10log a
= m cukup ditulis log a = m.
 Basis 10 pada logaritma tidak perlu
dituliskan.
 Contoh:
10log 3  dituliskan log 3
10log 5  dituliskan log 5
1. plog (a x b) = plog a + plog b
2. plog (a : b) = plog a - plog b
3. plog (a)n = n x plog a
n m
a = plog (a)n
m
4. plog
n
m plog a
=
1. Jika 2log x = 3
Tentukan nilai x = ….
Jawab:
2log x = 3  x = 23
x = 8.
2. Jika 4log 64 = x
Tentukan nilai x = ….
Jawab:
4log 64 = x  4x = 64
4x = 44
x = 4.
3. Nilai dari 2log 8 + 3log 9 = ….
Jawab:
= 2log 8 + 3log 9
= 2log 23 + 3log 32
= 3 + 2
= 5
4. Nilai dari 2log (8 x 16) = ….
Jawab:
= 2log 8 + 2log 16
= 2log 23 + 2log 24
= 3 + 4
= 7
5. Nilai dari 3log (81 : 27) = ….
Jawab:
= 3log 81 - 3log 27
= 3log 34 - 3log 33
= 4 - 3
= 1
6. Nilai dari 2log 84 = ….
Jawab:
= 2log 84
= 4 x 2log 23
= 4 x 3
= 12
7. Nilai dari 2log 84 = ….
Jawab:
= 2log 84 
= 2 x 2log 23
= 2 x 3
= 6
2
4 2log 8
=
8. Jika log 100 = x
Tentukan nilai x = ….
Jawab:
log 100 = x  10x = 100
10x = 102
x = 2.
log 3 = 0,477 dan log 2 = 0,301
Nilai log 18 = ….
a. 1,552
b. 1,525
c. 1,255
d. 1,235
log 3 = 0,477 dan log 2 = 0,301
log 18 = log 9 x 2
= log 9 + log 2
= log 32 + log 2
= 2 (0,477) + 0,301
= 0,954 + 0,301
= 1,255
log 3 = 0,477 dan log 2 = 0,301
Nilai log 18 = ….
a. 1,552
b. 1,525
c. 1,255
d. 1,235
c. 1,255
log 2 = 0,301 dan log 5 = 0,699
Nilai log 5 + log 8 + log 25 = ….
a. 2
b. 3
c. 4
d. 5
log 2 = 0,301 dan log 5 = 0,699
= log 5 + log 8 + log 25
= log 5 + log 23 + log 52
= log 5 + 3.log 2 + 2.log 5
= 0,699 + 3(0,301) + 2(0,699)
= 0,699 + 0,903 + 1,398
= 3,0
log 2 = 0,301 dan log 5 = 0,699
Nilai log 5 + log 8 + log 25 = ….
a. 2
b. 3
c. 4
d. 5 b. 3
Diketahui log 4,72 = 0,674
Nilai dari log 4.720 = ….
a. 1,674
b. 2,674
c. 3,674
d. 4,674
log 4,72 = 0,674
log 4.720 = log (4,72 x 1000)
= log 4,72 + log 1000
= log 4,72 + log 103
= 0,674 + 3
= 3,674
Diketahui log 4,72 = 0,674
Nilai dari log 4.720 = ….
a. 1,674
b. 2,674
c. 3,674
d. 4,674
c. 3,674
Diketahui log 3 = 0,477 dan log
5 = 0,699. Nilai log 135 = ….
a. 2,778
b. 2,732
c. 2,176
d. 2,130
log 3 = 0,477 dan log 5 = 0,699.
log 135 = log (27 x 5)
= log 27 + log 5
= log 33 + log 5
= 3(0,477) + 0,699
= 1,431 + 0,699
= 2,130
Diketahui log 3 = 0,477 dan log
5 = 0,699. Nilai log 135 = ….
a. 2,778
b. 2,732
c. 2,176
d. 2,130
d. 2,130
Diketahui log 3 = a dan log 2 = b.
Maka log 18 = ….
a. 2a – b
b. 2a + b
c. a + 2b
d. a – 2b
Diketahui log 3 = a dan log 2 = b.
log 18 = log (9 x 2)
= log 9 + log 2
= log 32 + log 2
= 2.log 3 + log b
= 2(a) + b
= 2a + b
Diketahui log 3 = a dan log 2 = b.
Maka log 18 = ….
a. 2a – b
b. 2a + b
c. a + 2b
d. a – 2b
b. 2a + b
Diketahui plog 27 = 3x
Maka plog 243 = ….
a. 4x
b. 5x
c. 6x
d. 7x
plog 27 = 3x
33 = p3x
Maka: x = 1 dan p = 3
plog 243 = 3log (3)5
= 5.3log 3
= 5 . X
= 5x
Diketahui plog 27 = 3x
Maka plog 243 = ….
a. 4x
b. 5x
c. 6x
d. 7x
b. 5x
Diketahui log 2 = 0,301
Maka log 50 = ….
a. 0,699
b. 1,301
c. 1,699
d. 2,301
log 2 = 0,301
log 50 = log (100 : 2)
= log 100 – log 2
= log 102 – log 2
= 2 – 0,301
= 1,699
Diketahui log 2 = 0,301
Maka log 50 = ….
a. 0,699
b. 1,301
c. 1,699
d. 2,301
c. 1,699
Jangan Lewatkan
Program Khusus
Pembahasan Soal-soal
UN 2001 s.d. 2005

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logaritma_1.ppt

  • 1.
  • 2. Plog a = m artinya a = pm Keterangan: p disebut bilangan pokok a disebut bilangan logaritma atau numerus dengan a > 0 m disebut hasil logaritma atau eksponen dari basis
  • 3.  Pada bentuk plog a = m, maka: 10log a = m cukup ditulis log a = m.  Basis 10 pada logaritma tidak perlu dituliskan.  Contoh: 10log 3  dituliskan log 3 10log 5  dituliskan log 5
  • 4. 1. plog (a x b) = plog a + plog b 2. plog (a : b) = plog a - plog b 3. plog (a)n = n x plog a n m a = plog (a)n m 4. plog n m plog a =
  • 5.
  • 6. 1. Jika 2log x = 3 Tentukan nilai x = …. Jawab: 2log x = 3  x = 23 x = 8.
  • 7. 2. Jika 4log 64 = x Tentukan nilai x = …. Jawab: 4log 64 = x  4x = 64 4x = 44 x = 4.
  • 8. 3. Nilai dari 2log 8 + 3log 9 = …. Jawab: = 2log 8 + 3log 9 = 2log 23 + 3log 32 = 3 + 2 = 5
  • 9. 4. Nilai dari 2log (8 x 16) = …. Jawab: = 2log 8 + 2log 16 = 2log 23 + 2log 24 = 3 + 4 = 7
  • 10. 5. Nilai dari 3log (81 : 27) = …. Jawab: = 3log 81 - 3log 27 = 3log 34 - 3log 33 = 4 - 3 = 1
  • 11. 6. Nilai dari 2log 84 = …. Jawab: = 2log 84 = 4 x 2log 23 = 4 x 3 = 12
  • 12. 7. Nilai dari 2log 84 = …. Jawab: = 2log 84  = 2 x 2log 23 = 2 x 3 = 6 2 4 2log 8 =
  • 13. 8. Jika log 100 = x Tentukan nilai x = …. Jawab: log 100 = x  10x = 100 10x = 102 x = 2.
  • 14.
  • 15. log 3 = 0,477 dan log 2 = 0,301 Nilai log 18 = …. a. 1,552 b. 1,525 c. 1,255 d. 1,235
  • 16. log 3 = 0,477 dan log 2 = 0,301 log 18 = log 9 x 2 = log 9 + log 2 = log 32 + log 2 = 2 (0,477) + 0,301 = 0,954 + 0,301 = 1,255
  • 17. log 3 = 0,477 dan log 2 = 0,301 Nilai log 18 = …. a. 1,552 b. 1,525 c. 1,255 d. 1,235 c. 1,255
  • 18. log 2 = 0,301 dan log 5 = 0,699 Nilai log 5 + log 8 + log 25 = …. a. 2 b. 3 c. 4 d. 5
  • 19. log 2 = 0,301 dan log 5 = 0,699 = log 5 + log 8 + log 25 = log 5 + log 23 + log 52 = log 5 + 3.log 2 + 2.log 5 = 0,699 + 3(0,301) + 2(0,699) = 0,699 + 0,903 + 1,398 = 3,0
  • 20. log 2 = 0,301 dan log 5 = 0,699 Nilai log 5 + log 8 + log 25 = …. a. 2 b. 3 c. 4 d. 5 b. 3
  • 21. Diketahui log 4,72 = 0,674 Nilai dari log 4.720 = …. a. 1,674 b. 2,674 c. 3,674 d. 4,674
  • 22. log 4,72 = 0,674 log 4.720 = log (4,72 x 1000) = log 4,72 + log 1000 = log 4,72 + log 103 = 0,674 + 3 = 3,674
  • 23. Diketahui log 4,72 = 0,674 Nilai dari log 4.720 = …. a. 1,674 b. 2,674 c. 3,674 d. 4,674 c. 3,674
  • 24. Diketahui log 3 = 0,477 dan log 5 = 0,699. Nilai log 135 = …. a. 2,778 b. 2,732 c. 2,176 d. 2,130
  • 25. log 3 = 0,477 dan log 5 = 0,699. log 135 = log (27 x 5) = log 27 + log 5 = log 33 + log 5 = 3(0,477) + 0,699 = 1,431 + 0,699 = 2,130
  • 26. Diketahui log 3 = 0,477 dan log 5 = 0,699. Nilai log 135 = …. a. 2,778 b. 2,732 c. 2,176 d. 2,130 d. 2,130
  • 27. Diketahui log 3 = a dan log 2 = b. Maka log 18 = …. a. 2a – b b. 2a + b c. a + 2b d. a – 2b
  • 28. Diketahui log 3 = a dan log 2 = b. log 18 = log (9 x 2) = log 9 + log 2 = log 32 + log 2 = 2.log 3 + log b = 2(a) + b = 2a + b
  • 29. Diketahui log 3 = a dan log 2 = b. Maka log 18 = …. a. 2a – b b. 2a + b c. a + 2b d. a – 2b b. 2a + b
  • 30. Diketahui plog 27 = 3x Maka plog 243 = …. a. 4x b. 5x c. 6x d. 7x
  • 31. plog 27 = 3x 33 = p3x Maka: x = 1 dan p = 3 plog 243 = 3log (3)5 = 5.3log 3 = 5 . X = 5x
  • 32. Diketahui plog 27 = 3x Maka plog 243 = …. a. 4x b. 5x c. 6x d. 7x b. 5x
  • 33. Diketahui log 2 = 0,301 Maka log 50 = …. a. 0,699 b. 1,301 c. 1,699 d. 2,301
  • 34. log 2 = 0,301 log 50 = log (100 : 2) = log 100 – log 2 = log 102 – log 2 = 2 – 0,301 = 1,699
  • 35. Diketahui log 2 = 0,301 Maka log 50 = …. a. 0,699 b. 1,301 c. 1,699 d. 2,301 c. 1,699
  • 36. Jangan Lewatkan Program Khusus Pembahasan Soal-soal UN 2001 s.d. 2005