Casio FX-7400GII, Руководство пользователя

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4-1
Chapter 4
Equation Calculations
From the Main Menu, enter the EQUA mode.
• { SIML } ... {linear equation with 2 to 6 unknowns}
• { POLY } ... {degree 2 to 6 equation}
• { SOLV } ... {solve calculation}
1. Simultaneous Linear Equations
You can solve simultaneous linear equations with two to six unknowns.
• Simultaneous Linear Equation with Two Unknowns:
a
1
x
+
b
1
y
=
c
1
a
2
x
+
b
2
y
=
c
2
• Simultaneous Linear Equation with Three Unknowns:
a
1
x
+
b
1
y
+
c
1
z
=
d
1
a
2
x
+
b
2
y
+
c
2
z
=
d
2
a
3
x
+
b
3
y
+
c
3
z
=
d
3
…
1. From the Main Menu, enter the EQUA mode.
2. Select the SIML (Simultaneous) mode, and specify the number of unknowns (variables).
You can specify from 2 to 6 unknowns.
3. Sequentially input the coefficients.
• The cell that is currently selected for input is highlighted. Each time you input a coefficient,
the highlighting shifts in the sequence:
a
1
m
b
1
m
c
1
m …
a
n
m
b
n
m
c
n
m (
n
= 2 to 6)
• You can also input fractions and values assigned to variables as coefficients.
• You can cancel the value you are inputting for the current coefficient by pressing
)
at
any time before you press U to store the coefficient value. This returns to the coefficient
to what it was before you input anything. You can then input another value if you want.
• To change the value of a coefficient that you already stored by pressing
U
, move the
cursor to the coefficient you want to edit. Next, input the value you want to change to.
• Pressing (CLR) clears all coefficients to zero.
4. Solve the equations.
Example To solve the following simultaneous linear equations for
x
,
y
, and
z
4
x
+
y
– 2
z
= – 1
x
+ 6
y
+ 3
z
= 1
– 5
x
+ 4
y
+
z
= – 7
4