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³ log 5 =b --> log 5 / log 3= b --> log 5 = b log 3 = b ( a log 2)= ab log 2
1.) ² log 15 = ² log 3 + ² log 5 = ² log 3 + log 5/log 2 = a + ab log 2/log 2 = a +ab
2.) 4 log 75 = log 75 /log 4 = log 3 + log 25 / 2 log 2 = log 3 + 2 log 5 / 2 log 2
= a log 2+ 2 ab log 2 / 2 log 2 = log 2 (a +2ab) / 2 log 2 = a+ 2ab / 2
4.) ² log 5 = log 5 / log 2= ab log 2 / log 2 = ab