Question

Jika ^2 log 3 = a & ^3 log 5 = b
maka ^15 log 20=...

Answer 1

^2 log 3 =a
^3 log 5 =b
^2 log 5 =ab
^15 log 20
=(^3 log 20)/(^3 log 15)
=(^3 log (4.5))/^(3 log (3.5)
=^3 log 2^2 +^3 log5/ ^3 log 3 +^3 log 5
=2/a +b /(1+ b)
=(2+ab)/(a+ab)

Answer 2

²log3=a
log 3/log 2 =a
 log 3=a.log 2
³log 5 =b
  log 5/log3=b
 log5 = b.log3

^15 log 20=log 20/log 15
               = log 5.4 / log  5 .3
               = b.log 3 + log 4 / b.log 3 +log 3
               =log  4 / log 3
               = log 2 +log 2 / a log 2
               = log 2 / a


klo salah maklumi yhh