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³log 5 = b
a) ²log 15 = ²log 5 + ²log 3
= ²log 5 + a
b) ⁴log 75 = ³log 75 / ³log 4
= (³log 5² + ³log 3) / (³log 2²)
= (2 . ³log 5 + 1) / (2 ³log 2)
= (2b + 1) / 2b
c) ²⁵log 36 = ³log 36 / ³log 25
= (³log 3² + ³log 2²) / ³log 5²
= (2 + 2/a) / 2b
= (2a + 2) / 2ab
= (a + 1)/ab
d) ²log 5 =
e) ³⁰log 150 = ³log 150 / ³log 30
= (³log 5² + ³log 3 + ³log 2) / (³log 3 + ³log 2 + ³log 5)
= (2b + 1 + 1/a) / (1 + 1/a + b)
f) ¹⁰⁰log 50 = ³log 50 / ³log 100
= (³log 5² + ³log 2) / ³log 2² + ³log 5²
= (2b + 1/a) / 2/a + 2b