Casio fx-82MS, Руководство пользователя

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Mastering the Calculator using the Casio fx-82MS
37
Example 1
Solve equation
Taking logs of both sides;
To find the value of a, the keystrokes are:
The display should read 4.3219281.
So, . Confirm this by using the key.
Example 2
Given , find the value of y
The key is above the log key. Hence the keystrokes are:
The display should read 38.370725
Example 3 (harder)
Given , find the value of x
To find log
x, the calculator keystrokes are:
2
a
20 =
log 2 log 20
log 2 log 20
log 20
log 2
a
a
a
=
⇒ =
⇒ =
4.32
2 20
≈
log y 1.584 =
log y 1.584 =
y
⇒
10
1.584
=
10
x
log
x
6 1.5 =
log 6 1.5
log 6
1.5
log
log 6
log
1.5
x
x
x
=
⇒ =
⇒ =