Casio fx-3650P

34
24 The inverse of a 2
×
2 matrix.
The inverse of the ２×２ matrix is . In other words,
As is clear from the formula above, when the denominator , no inverse exists.
Program
Ｌｂｌ １：？→ Ａ：？→ Ｂ：？→ Ｃ：？→ Ｄ：ＡＤ － ＢＣ → Ｍ：Ｍ ＝０⇒ Ｇｏｔｏ １：
Ａ→Ｘ：Ｄ÷Ｍ→Ａ：Ｘ÷Ｍ→Ｄ：－Ｂ÷Ｍ→Ｂ：－Ｃ÷Ｍ→Ｃ：Ａ Ｂ Ｃ Ｄ ＜71 STEP＞
INPUT A, B, C, D : matrix
OUTPUT A, B, C, D : inverse of matrix
Execution Example:
The inverse matrix of is
For , the inverse does not exist and the values and must be re-entered.
ab
cd



1
ad bc–
------------------
db–
c– a



1
ad bc–
------------------
db–
c– a



ab
cd



1 0
0 1



=
a d bc– 0=
ab
cd



ab
cd



1 4
24



1– 1
0.5 0.25–



Prog
1
1
EXE
4
EXE
2
EXE
4
EXE
M
Disp
S A
D R P1
P1
P2 P3 P4 G
EXE
M
Disp
S A
D R P1
P1
P2 P3 P4 G
EXE
M
Disp
S A
D R P1
P1
P2 P3 P4 G
EXE
M
S A
D R P1
P1
P2 P3 P4 G
ad bc 0=– abc,, d
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