- 2·log₇ (7⁷) + 7·log₂ (2⁵) =
= - 2 · 7·log₇ 7 + 7 · 5·log₂ 2 =
= - 14· log₇ 7 + 35·log₂ 2 =
= - 14 · 1 + 35 · 1 = - 14 + 35 = 21
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- 2·log₇ (7⁷) + 7·log₂ (2⁵) =
= - 2 · 7·log₇ 7 + 7 · 5·log₂ 2 =
= - 14· log₇ 7 + 35·log₂ 2 =
= - 14 · 1 + 35 · 1 = - 14 + 35 = 21