Jawabanmu

2014-08-23T13:13:27+07:00
A.Log 18 = Log (2 x 3 x 3)
= Log 2 + Log 3 + Log 3
=0.3010 + 0.4771 +0.4771 =1.2552

B.Log 21 = Log (7 x 3)
=Log 7 + Log 3
=0.8451 + 0.4771
=1.3222

C Log 10.5 = Log(21/2)
= Log 21 - Log 2
=1.3222  -0.3010
=1.0212

D.Log 1/7 = Log( 1/7)
=Log1 - Log 7
= 0 - 0.8451
=-0.8451
CMIIW



  • lel
  • Gemar Membantu
2014-08-23T13:33:50+07:00
A. log 18 = log (9 . 2)
= log 3² + log 2
= 2 × 0,4771 + 0.3010
= 0,9542 + 0.3010
= 1,2552
b. log 21 = log (7 × 3)
= log 7 + log 3
= 0,8451 + 0,4771
= 1,3222
c. log 10,5 = log ( \frac{7 . 3}{2} )
= log 7 + log 3 - log 2
= 0,8451 + 0,4771 - 0,3010
= 1,3222-0,3010
= 1,0212
d. log  \frac{1}{7} = log  7^{-1}
= -1 × 0,8451
= -0,8451