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Kelas 10Matematika
Bab 1 - Pangkat Akar dan Logaritma
diketahui :
²log 3 = a ⇔ ³log 2 = 1 / a
³log 5 = b
step 1 : menentukan nilai dari ¹⁵log 18
¹⁵log 18 = ³log 18 ÷ ³log 15
¹⁵log 18 = ³log (3² x 2) ÷ ³log (3 x 5)
¹⁵log 18 = (2 + ³log 2) ÷ (1 + ³log 5)
¹⁵log 18 = (2 + 1/a) ÷ (1 + b)
¹⁵log 18 = (2a + 1) ÷ (a + ab)
log3/log2 = a >>> log 2 = log 3/a
³log 5 = b
log5/log3 = b >> log 5 = b log 3
15log18 = log 18 / log 15
= log 3.3.2 / log 3.5
= log 3 + log 3 + log 2 / log 3 + log 5
= log 3 + log 3 + log 3/a / log 3 + blog 3
= log 3(1+1+1/a) / log 3 (1 + b)
= (2 + 1/a) / (1 + b)
=( 2a + 1) / (a + ab)