Potrzebuje pomocy z obliczeniem tych dwoch logarytmow
.: log x 1125 =−3
log 12 x=−5
5 cze 22:54
wredulus_pospolitus:
a)
| 1 | |
| = (125)−1 = (53)−1 = 5−3 |
| 125 | |
log
x(5
−3) = −3log
x5
= −3 ⇔ log
x5 = 1 ⇔ x =
b)
| | 1 | |
log1/2 x = |
| log 2x = −log 2x = −5 ⇔ log 2x = 5 ⇔ x = |
| | −1 | |
5 cze 22:56