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więc:
log 1/4 v2 =x
1/4^x=v2
(4^-1)^x=2^1/2
(2^-2)^x=2^1/2
2^-2x=2^1/2
opuszczam podstawy:
-2x=1/2 /*(-1/2)
x=-1/4
Stąd masz