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15log40= 40=5log(2³x5) = 3.5log2+5log5 = 3/b+1 x b = 3+b
15=5log(3x5) 5log3+5log5 a+1 b b(a+1)
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= .... beri bilangan pokok 5
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= ....jawaban A
= 3 -----> a = 2³ = 8
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