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= 7(3-√2) / (3+√2)(3-√2)
= (21-7√2) / (9-2)
= (21-7√2) / 7
= 3-√2
³log 15 + ³log 45 - ³log 25
= ³log (15×45:25)
= ³log 27
= ³log 3³
= 3 ³log 3
= 3 × 1
= 3