1. jika log 2 = x , log 3 = y , dan log 7 = z , maka =

1. jika log 2 = x , log 3 = y , dan log 7 = z , maka =
a) log 12
= log(4×3)
= log4 + log3
= log2² + log3
= 2x + y

b) log 42
= log(7 x 3 x 2)
= log 7 + log3 + log2
= z + y + x

c) log 63
= log(7 x 9)
= log7 + log3²
= z + 2y

d) log 98
= log(9 x 8)
= 2y + 3x

2. jika ^2 log 3 = a dan ^2 log 5 = b , maka nyatakan ekspresi-ekpresi berikut terhadap a/b =

a) ^4 log 9
²log9 / ²log4
= ²log3² / ²log2²
= 2a / 2

b) ^8 log 27
^2³log3³
= (3/3)²log3
=a

c) ^15 log 100
= ²log100 / ²log15
= ²log(25×4) / ²log(5×3)
= 2b + 2 / b + a

d) ^2 log 15
= b + a