Texas Instruments TI-73 EXPLORER 用户手册
54
Chapter 2: Math Operations
7302ENG.DOC CH2 Math Operations, English Julie Hewlett Revised: 07/29/98 11:58 AM Printed: 05/19/99 8:58
AM Page 54 of 32
The 1
LOG Menu
The 1
LOG
(logarithm) menu lets you select functions that
are used to calculate base-10 and base-e logarithms and
powers.
1 " " "
NorN
NorN
1 !
1:log(
Returns the base-10 logarithm of a value.
2:10^(
Raises 10 to a power.
3:ln(
Calculates the natural logarithm of a value.
4:e^(
Raises e to a power (e = 2.71828182846).
log(
log( 1
"
"
"
1
1
The logarithm is the exponent, x, indicating the power which a
fixed number (using base 10) must be raised to in order to
produce a given number, a.
log(
returns the logarithm of a positive real number, an
expression that results in a positive real number, or a list of
positive real numbers.
log(
value
)
log(
list
)
Calculate log(30).
: 1 " " "
1
3 0
E b
³
For 10x =a, log
10
a=x