Processing math: 100%
[
a
b
c
d
]
⋅
[
a
′
b
′
c
′
d
′
]
=
[
a
a
′
+
b
c
′
a
b
′
+
b
d
′
a
′
c
+
c
′
d
b
′
c
+
d
d
′
]
[
a
b
c
d
]
⋅
[
1
0
0
1
]
=
[
a
b
c
d
]
Got it !
Multiplication de deux matrices d'égales dimensions :
[
1
2
3
4
]
⋅
[
0
1
2
3
]
=
[
4
7
8
15
]
[
1
x
3
4
y
0
1
0
1
]
⋅
[
0
−
x
1
1
1
0
1
1
1
]
=
[
x
+
3
3
4
y
y
−
4
x
4
1
1
−
x
2
]
L'élément neutre est la matrice unité :
[
1
2
3
4
]
⋅
[
1
0
0
1
]
=
[
1
2
3
4
]
[
1
x
3
4
y
0
1
0
1
]
⋅
[
1
0
0
0
1
0
0
0
1
]
=
[
1
x
3
4
y
0
1
0
1
]