![{\displaystyle \log _{a}1=0\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/413560a8857028db8d223d20aed7b201f2609022)
![{\displaystyle \log _{a}a=1\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/bdda1670110b65e860ad55ed5d17edf9c7b8157c)
ផលគុណ ផលចែក និងអិចស្ប៉ូ
[កែប្រែ]
![{\displaystyle \log _{c}(a\cdot b)=\log _{c}a+\log _{c}b\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e6f53d4a67093f84f9cdaa5195a6f9aac0d17578)
![{\displaystyle \log _{c}\left({\frac {a}{b}}\right)=\log _{c}a-\log _{c}b\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/54c64541e79ed52dfe1afb0c14fe6280a6ef0b45)
![{\displaystyle \forall r\in \mathbb {R} ,\ \log _{c}(a^{r})=r\cdot \log _{c}a\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b17841ed605420ed8d9187d1b73cf74b7bc49e0e)
ចំពោះ ![{\displaystyle a>b\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/6a472db05ed6a68e5fbd8ba96a86f6041e60fbfa)
ចំពោះ ![{\displaystyle a>b\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/6a472db05ed6a68e5fbd8ba96a86f6041e60fbfa)
![{\displaystyle a^{\log _{a}b}=b\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/055ba679da66c10c72606f221894e8a8c8108123)
- ចំពោះគ្រប់ចំនួនពិត
គេបាន ![{\displaystyle \log _{a}(a^{r})=r\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5bac6391085dd9d14500a98b287941229052cbf4)
រូបមន្តមុនត្រូវបានប្រើដើម្បីដោះស្រាយសមីការរកអញ្ញត្តិដែលមានស្វ័យគុណ។
វិធីសាស្រ្តប្តូរគោលនៃលោការីត
[កែប្រែ]
![{\displaystyle \log _{a}b={\frac {\log _{c}b}{\log _{c}a}}\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/8886efd02905a8af9bed4225e0d0977e10408498)
រូបមន្តនេះមានសារៈសំខាន់សំរាប់គណនាលោការីតដោយប្រើម៉ាស៊ីនគណនា។
![{\displaystyle \log _{a}b\cdot \log _{c}d=\log _{a}d\cdot \log _{c}b}](https://wikimedia.org/api/rest_v1/media/math/render/svg/73bfcfb42b59f233cbb12829de15638c67f546e6)
ចំពោះ ![{\displaystyle a>1\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/67fc6f7e9ae79b0aa0fadf5fe3c70c865dbbd091)
ចំពោះ ![{\displaystyle 0<a<1\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/de1ac94cb4b49ae79fd21f73ad6fb577a7d129c6)
ចំពោះ ![{\displaystyle a>1\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/67fc6f7e9ae79b0aa0fadf5fe3c70c865dbbd091)
ចំពោះ ![{\displaystyle 0<a<1\,}](https://wikimedia.org/api/rest_v1/media/math/render/svg/de1ac94cb4b49ae79fd21f73ad6fb577a7d129c6)
ចំពោះ
ចំនួនសន្និទានវិជ្ជមាន
ចំពោះ
ចំនួនសន្និទានវិជ្ជមាន
![{\displaystyle (\log _{a}x)'={\frac {1}{x\ln a}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b3051618b1c6b8208a9928c3759b7ceb5ac36979)
ក្នុងករណីពិសេស គោល e ៖
![{\displaystyle (\ln x)'={\frac {1}{x}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/189cac786f57ab6a12a34c4621923fc41aa8ca05)
![{\displaystyle \int \log _{a}x\;\mathrm {d} x=x\cdot \left[\log _{a}x-{\frac {1}{\ln a}}\right]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/db42a66c6cde67b2de772dfd74b92530061df49f)