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Bab LogaritmaMatematika SMA Kelas X
1/((x - 2)^log 5) + 2/((x - 2)^log 5) + .... + 20/((x - 2)^log 5) = 210
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1 + 2 + 3 + 4 + .... + 20
= 1/2 . 20 . (20 + 1)
= 10 . 21
= 210
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(5^log (x - 2)) . 210 = 210
5^log (x - 2) = 210 : 210
x - 2 = 5^1
x = 5 + 2
x = 7
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