1, ln is the abbreviation of Napier logarithm or natural logarithm, which is called natural logarithm. Is the logarithm based on e = 2.7 1828 1828. Ln is pronounced /l? : n/[ Ron]

2，ln 10 = LG 10/lge = 1/0.43429448 1 = 2.302585098。

The above formula is used to calculate the bottom. There are scientific calculators now, but lna can be calculated directly.

Lnx=lgx/lge。 Lga can also be obtained directly from the calculator.

Note: lgx is the logarithm of X based on 10.