1) log₈14 · log₁₄15 ·log₁₅16 = log₈16 = 4/3 log₂2 = 4/3; 2) log₇5 · log₅4 · log₃₂7 = 2/5 · log₇5 · log₅2 · log₂7 = 2/5 log₇7 = 2/5; 3) log₂10 log₁₀11 log₁₁128 = log₂128 = 7· log₂2 = 7; 4) log₁₀₀₀9 · log₃10 = 2/3 · log₁₀3 · log₃10 = 2/3; 5) log₁₂₈81 · log₃2 = 4/7 log₂3 · log₃2 = 4/7; 6) log₈5 · log₁₂₅16 = 4/9 · log₂5 · log₅2 = 4/9
1) log₈14 · log₁₄15 ·log₁₅16 = log₈16 = 4/3 log₂2 = 4/3; 2) log₇5 · log₅4 · log₃₂7 = 2/5 · log₇5 · log₅2 · log₂7 = 2/5 log₇7 = 2/5; 3) log₂10 log₁₀11 log₁₁128 = log₂128 = 7· log₂2 = 7; 4) log₁₀₀₀9 · log₃10 = 2/3 · log₁₀3 · log₃10 = 2/3; 5) log₁₂₈81 · log₃2 = 4/7 log₂3 · log₃2 = 4/7; 6) log₈5 · log₁₂₅16 = 4/9 · log₂5 · log₅2 = 4/9