Question

se log2=30, log3=47, log5=0,69, log7=0,84 determine o valor de : a)log2,5
b)log1,4
c)log0,1

Answer 1

log2=30, log3=47, log5=0,69, log7=0,84 determine o valor de :

a)log2,5 ==> log 25/10 ==> log5^2 - log10

2log5 - 1 ==> 2.(0,69) - 1 ==> 1,38 - 1 ==> 0,38
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b)log1,4 ==>  log 14/10 ==> log(7.2) - log10 

log7 + log2 - 1 ==> 0,84 + 0,30  - 1 ==> 1,14 - 1 ==> 0,14
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c)log0,1 ==> log 1/10 ==> log1 - log10 

0 - 1 ==>  - 1 

log 1 = x ==> 10^x = 1 ==> 10^x = 10^0 ==> x = 1
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