Feu un programa que digui si una matriu 2 × 2 donada
és invertible o no.
Entrada
L’entrada consisteix en una matriu 2 × 2 d’enters,
en l’ordre següent:
a11
a12
a21
a22
Sortida
Si la matriu és invertible, escriviu “Es invertible.”.
Si no ho és, escriviu “No es invertible.”.
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