Question

Imi trebuie repede!
Ms frumos.​

Answer 1

a) | 3 3 3 | | 0 2 2 | | 5 0 0 |

| 0 3 3 | - | 0 0 2 | + | 0 5 0 | =

| 0 0 3 | | 0 0 0 | | 0 0 5 |

| 3 1 1 | | 5 0 0 |

= | 0 3 1 | + | 0 5 0 | =

| 0 0 3| | 0 0 5 |

| 8 1 1 |

=| 0 8 1 |

| 0 0 8|

b) | 1 1 1 | | 0 1 1 | | 1 0 0 |

| 0 1 1 | = | 0 0 1 | + | 0 1 0 |

| 0 0 1 | | 0 0 0| | 0 0 1 |

| 1 1 1 | | 1 1 1 |

| 0 1 1 | = | 0 1 1 |

| 0 0 1 | | 0 0 1 |

| 1 1 1 |

det(A)= | 0 1 1 | = 1+0+0-0-0-0=1

| 0 0 1 |

1 1 1

0 1 1