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18.03.2013

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log37, , log637 = a.

: 2a/(1 - a).


log212, , log169 = a.

: 2(a + 1).


ln100, , log5e = a, log2e = b.

: 2(1/a + 1/b).


log5(3x - 11) + log5(x - 27) = 3 + log58.

: x = 37.


lg(x - 1) + lg(x + 1) = 3lg2 + lg(x - 2).

: x = 3 x = 5.


2lgx - lg4 = -lg(5 - x2).

: x = 1 x = 2.


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