Réponse :
Explications étape par étape
Bonsoir
... | -5/3 | 4/9
... | -2/3 | ...
1 .| ....... | .....
Tout d’abord on calcule le produit de la diagonale pour connaître la valeur pour chaque ligne, colonne, diagonale
1 x -2/3 x 4/9 = -8/27
Première ligne :
... x -5/3 x 4/9 = -8/27
... x -20/27 = -8/27
... = -8/27 x -27/20
... = 27/27 x 8/20
... = 2/5
1ère colonne :
2/5 x ... x 1 = -8/27
... x 2/5 = -8/27
... = -8/27 x 5/2
... = -8/2 x 5/27
... = -4 x 5/27
... = -20/27
2eme ligne :
-20/27 x -2/3 x ... = -8/27
40/81 x ... = -8/27
... = -8/27 x 81/40
... = -8/40 x 81/27
... = -1/5 x 3
... = -3/5
2eme colonne :
-5/3 x -2/3 x ... = -8/27
10/9 x ... = -8/27
... = -8/27 x 9/10
... = -9/27 x 8/10
... = -1/3 x 4/5
= -4/15
Dernière ligne :
1 x -4/15 x ... = -8/27
-4/15 x ... = -8/27
... = -8/27 x -15/4
... = 15/27 x 8/4
... = 5/9 x 2
... = 10/9
2/5 ......| -5/3 | 4/9
-20/27 | -2/3 | -3/5
1 ...........| -4/15 | 10/9
On vérifie la dernière colonne :
= 4/9 x -3/5 x 10/9
= -3/9 x 10/5 x 4/9
= -1/3 x 2 x 4/9
= -8/27 ok
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Réponse :
Explications étape par étape
Bonsoir
... | -5/3 | 4/9
... | -2/3 | ...
1 .| ....... | .....
Tout d’abord on calcule le produit de la diagonale pour connaître la valeur pour chaque ligne, colonne, diagonale
1 x -2/3 x 4/9 = -8/27
Première ligne :
... x -5/3 x 4/9 = -8/27
... x -20/27 = -8/27
... = -8/27 x -27/20
... = 27/27 x 8/20
... = 2/5
1ère colonne :
2/5 x ... x 1 = -8/27
... x 2/5 = -8/27
... = -8/27 x 5/2
... = -8/2 x 5/27
... = -4 x 5/27
... = -20/27
2eme ligne :
-20/27 x -2/3 x ... = -8/27
40/81 x ... = -8/27
... = -8/27 x 81/40
... = -8/40 x 81/27
... = -1/5 x 3
... = -3/5
2eme colonne :
-5/3 x -2/3 x ... = -8/27
10/9 x ... = -8/27
... = -8/27 x 9/10
... = -9/27 x 8/10
... = -1/3 x 4/5
= -4/15
Dernière ligne :
1 x -4/15 x ... = -8/27
-4/15 x ... = -8/27
... = -8/27 x -15/4
... = 15/27 x 8/4
... = 5/9 x 2
... = 10/9
2/5 ......| -5/3 | 4/9
-20/27 | -2/3 | -3/5
1 ...........| -4/15 | 10/9
On vérifie la dernière colonne :
= 4/9 x -3/5 x 10/9
= -3/9 x 10/5 x 4/9
= -1/3 x 2 x 4/9
= -8/27 ok