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⁵Log 2 = 1/b
³Log 2. ²Log 5 = ³Log 5 = b/a
⁵Log 3 = a/b
a. ²Log (3.5) = ²Log 3 + ²Log 5
= a + b
b. ⁴Log 75 = ⁴Log (25x3)
= ⁴Log 25 + ⁴Log 3
= ⁴Log 5² + 1/³Log 4
= (2 ⁴Log 5) + (1/ ³Log 2²)
= (2 / ⁵Log 4) + (1 / 2³Log 2)
= (2/ ⁵Log 2²) + (1/ 2³Log 2)
= (2/ 2⁵Log 2) + (1/ 2³Log 2)
= (1 / ⁵Log 2) + (1/ 2³Log 2)
= ²Log 5 + (²Log 3 / 2)
= b + a/2
= a+2b / 2
atau : ⁴Log 75 = ²^²Log (5².3)
= 1/2 (²Log 5² + ²Log 3)
= 1/2 (2 ²Log 5 + ²Log 3)
= 2 ²Log 5 + ²Log 3 / 2
= 2b+a / 2
= a+2b / 2
c. ²⁵Log 36 = ⁵^²Log 6²
= 2/2 ⁵Log 6
= ⁵Log 6
= ⁵Log (2.3)
= ⁵Log 2 + ⁵Log 3
= 1/b + a/b
= a+1 / b
atau : Log 36 / Log 25 = Log 6² / Log 5²
= Log 6 / Log 5
= ⁵Log 6
= ⁵Log 3 + ⁵Log 2
= a/b + 1/b
= a+1 / b
d. ²Log 5 = b
e. ³⁰Log 150 = ³⁰Log (5².3.2)
= ³⁰Log 5²+³⁰Log 3 + ³⁰Log 2
= 2 ³⁰Log 5 + ³⁰Log 3 + ³⁰Log 2
= (2/ ⁵Log 30) + (1/ ³Log 30) + (1/ ²Log 30)
= 2/ (⁵Log 5+⁵Log 2+⁵Log 3) + 1/ (³Log 5+³Log 2+³Log 3) + 1/ (²Log 5+²Log 2+ ²Log 3)
= (2 / 1+1/b + a/b) + (1/ b/a +1/a + 1) + (1/ b+1+a)
= 2/ (a+b+1)/b + 1/ (a+b+1)/a + 1/ (a+b+1)
= 2b / (a+b+1) + a / (a+b+1) + 1/ (a+b+1)
= a+2b+1 / a+b+1
f. ¹⁰^²Log (5².2) = 1/2 [ ¹⁰Log 5² + ¹⁰Log 2 ]
= 1/2 [ 2 ¹⁰Log 5 + ¹⁰Log 2 ]
= 1/2 [ 2/ ⁵Log 10 + 1/ ²Log 10 ]
= 1/2 [ 2/ ⁵Log 5+⁵Log 2 + 1/ ²Log 2+² Log 5 ]
= 1/2 [ 2/ 1+1/b + 1/ 1+b ]
= 1/2 [ 2/ 1+b/b + 1/ 1+b ]
= 1/2 [ 2b/ 1+b + 1/ 1+b ]
= 1/2 [ 2b+1/ 1+b ]
= 2b+1 / 2b+2