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4 ) log 3 = 0,477 ; log 5 = 0,699
log 135 = log (3³ x 5)
= log 3³ + log 5
= 3 . log 3 + log 5
= 3 . 0,477 + 0,699
= 1,431 + 0,699
= 2,130
5 ) log 3 = a ; log 2 = b
log 18 = log (3² x 2)
= log 3² + log 2
= 2 . log 3 + log 2
= 2.a + b
6) = 3x
3³ = 3x
3 . = 3x
= 3x : 3
= x
=
= 5 .
= 5.x