−2????)????−1
???? = ????−1(−2????)????−1
RTA

???? + ???????????? − ???????????? = ???? + ???????????????? − ????????????
???? + ???? = ???? + ???????????????? − ????????????
???? = ???? + ???????????????? − ????????????
RTA Resolución de la práctica de Determinantes AÑO 2020

((3???????? − ????)????)???? = (2????)????
3???????? − ???? = 2????????
3???????? − ???? + ???? = 2???????? +????
3???????? + ???? = 2???????? + ????
3????????. ????−1 = (2???????? + ????). ????−1
3????. ???? = (2???????? + ????). ????−1
1
3
3???? =
1
3
[(2???????? + ????). ????−1]
???? =
1
3
[(2???????? + ????). ????−1]
RTA


(????????)???? + 3???????? = 2???? − ????
???????????????? + 3???????? = 2???? − ????
????????(???????? + 3????) = 2???? − ????
????????(???????? + 3????)(???????? + 3????)−1 = (2???? − ????)(???????? + 3????)−1
???????? . ???? = (2???? − ????)(???????? + 3????)−1
(????????)???? = [(2???? − ????)(???????? + 3????)−1]????
???? = [(2???? − ????)(???????? + 3????)−1]????
RTA

1
2
???? + ???????? = ????−1???? + (????????)−1 Resolución de la práctica de Determinantes AÑO 2020
1
2
???? + ???????? = ????−1???? + ????−1????−1
1
2
???? + ???????? = ????−1(???? + ????−1)
(
1
2
???? + ????????) (???? + ????−1)−1 = ????−1(???? + ????−1)(???? + ????−1)−1

[(
1
2
???? + ????????) . (???? + ????−1)−1]
−1
= (????−1)−1

(???? + ????−1) (
1
2
???? + ????????)
−1
= ????
RTA