| logcb | ||
logab= | ||
| logca |
| 1 | |
= 5−1
| |
| 5 |
| log73 | 1 | 4log75 | |||
* | *log754= | = −4 | |||
| log75−1 | log73 | −log75 |
| loga c | ||
logb c= | ||
| loga b |
| log3 3 | 1 | |||
log1/5 3 = | = | |||
| log3 1/5 | log3 1/5 |
| log3 625 | ||
log7 625 = | ||
| log3 7 |
| 1 | log3 625 | ||
* log3 7 * | =
| ||
| log3 1/5 | log3 7 |
| log3 625 | ||
= | = log1/5 625 = −4
| |
| log3 1/5 |