Log 2 = 0,3010 log 3 = 0,4771 log 7 = 0,8451 tentukan... a. log 18 b. log 21 c. log 10,5 d. log 1/7 .... Question from @alyaashafira

October 2018 2 31 Report

Log 2 = 0,3010
log 3 = 0,4771
log 7 = 0,8451

tentukan...
a. log 18
b. log 21
c. log 10,5
d. log 1/7

mohon bantuannya

MicoArrafi $$\begin{align} \log18&=\log(2\times3^2)\\&=\log2+\log3^2\\&=\log2+2\times\log3\\&=0,301+2\times0,4771\\&=0,301+0,9542\\&=\bold{1,2552}\\\\\log21&=\log(3\times7)\\&=\log3+\log7\\&=0,4771+0,8451\\&=\bold{1,3222}\\\\\log10,5&=\log(21:2)\\&=\log(3\times7:2)\\&=\log3+\log7-\log2\\&=0,4771+0,8451-0,301\\&=\bold{1,0212}\\\\\log\frac{1}{7}&=\log1-\log7\\&=0-0,8451\\&=\bold{-0,8451} \end$

1 votes Thanks 2

ydhh A
$\log 18=\log (3^2\cdot 2)=2\log 3+\log 2=2(0,4771)+(0,3010)=1,2552$

b
$\log 21=\log (3\cdot 7)=\log 3+\log 7=(0,4771)+(0,8451)=1,3222$

c
$\log 10,5=\log (\frac{3\cdot 7}{2})=\log 3+\log 7-\log 2=(0,4771)+(0,8451)-(0,3010)=1,0212$

d
$\log (\frac{1}{7})=\log 7^{-1}=-\log 7=-0,8451$

1 votes Thanks 1

About Us

Life Enjoy

" Life is not a problem to be solved but a reality to be experienced! "

What will you say if your little brother is watching television whereas there will be examination tomorrow?

^1/2log3 x ^3log32 =?

^3log15 + ^3log6 - ^3log10 = ???

Bagaimana sejarah terbentuknya kepulauan di Indonesia??? Mohon bantuannya

Matematika kelas 10 SMA. mohon bantuannya

Cara Kerja Stopwatch????

Fungsi neraca pegas adalah??????

4 log 4^10 = (dibacanya 4 log 4 pangkat 10) mohon bantuannyaa

Persamaan dari 2^x = 8 ??? (itu dibaca dua pangkat x)

-2a^2b^-4 : 5a^-5b-6 (itu kaya pecahan gitu. kalau ada ^ berarti pangkat) mohon dibantu ya trims

Recommend Questions

Life Enjoy

Get in touch

Social