作业 1107

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Homework 13

  1. (a) (8,−12,5)(8, -12, 5) .

    (b) (1,1,−1)(1, 1, -1) .

  2. (40,58)(40, 58) .

  3. ((−4,−7),(72,6))( ( -4, -7 ), ( \frac{7}{2}, 6 ) ) .

  4. (2,0,−1)(2, 0, -1) or (11,6,−1)(11, 6, -1) .

  5. ((9,6,0),(0,−4,−3))( (9, 6, 0), (0, -4, -3) ) .

  6. a. (4−10−11101−2)\begin{pmatrix}4 & \mathop{-}1 & 0\\ \mathop{-}1 & 1 & 1\\ 0 & 1 & \mathop{-}2\end{pmatrix} .

    b. (8,2,2)(8, 2, 2) .

  7. (−31−52)\begin{pmatrix}\mathop{-}3 & 1\\ \mathop{-}5 & 2\end{pmatrix} , (−21−53)\begin{pmatrix}\mathop{-}2 & 1\\ \mathop{-}5 & 3\end{pmatrix} .

  8. SpaceDimensionBasis
    Null⁡A\operatorname{Null} A33((0,−2,1,0,0),(0,0,−2,4,−2),(1,0,0,0,0))( (0, -2, 1, 0, 0), (0, 0, -2, 4, -2), (1, 0, 0, 0, 0) )
    Null⁡AT\operatorname{Null} A^\mathrm T11((−1,1,−1))( (-1, 1, -1) )
    Col⁡A\operatorname{Col} A22((1,1,0),(3,4,1))( (1, 1, 0), (3, 4, 1) )
    Row⁡A\operatorname{Row} A22((0,1,2,3,4),(0,1,2,4,6))( (0, 1, 2, 3, 4), (0, 1, 2, 4, 6) )
    Null⁡B\operatorname{Null} B11((0,1,−2,1))( (0, 1, -2, 1) )
    Null⁡BT\operatorname{Null} B^\mathrm T00()()
    Col⁡B\operatorname{Col} B33((1,6,9),(2,13,26),(3,20,44))( (1, 6, 9), (2, 13, 26), (3, 20, 44) )
    Row⁡B\operatorname{Row} B33((1,2,3,4),(6,13,20,27),(9,26,44,62))( (1, 2, 3, 4), (6, 13, 20, 27), (9, 26, 44, 62) )
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