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Løs likningene:
a) ln ( x + 1 ) + ln ( x - 1 ) = ln 3
Svaret skal være: x = 2
b) ln x + ln ( 2 - x ) = 0
Svaret skal være: x = 1
c) lg ( 11 - x ) - lg ( 2 - x ) = 1
Svaret skal være: x = 1
d) lg ( x + 33 ) - lg x = 2
Svaret skal være: x = 1/3
Takk på forhånd.
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