• 2022-07-26
    求向量场[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]的旋度:[tex=5.714x1.429]a26otTxTTSC41LGI815eKVKZBBhm1uLiKlNGQ8f//BI=[/tex][tex=11.071x1.5]3JGEWLXBR60RhCwx2UDikz0X1RIY6LRF3PmuSGeXYRKP8GMQ4SKtQww03/m+1NfY[/tex] .
  • [b]解[/b]    [tex=19.143x5.786]fqMDZ8yh/z54LywQDqdcbQxSCnQtxRblvMwL1z5/nqfpJRc47Vu/ZRWKFptCSdhcHSwkR2gJpeaLpYKblMI8afyoleVORWXIrd2/uTZfIynzWIwVaJlPyLDHSPeizj4zixJH4NT5elHY2L4N4aiVGV1/BSoiL59a8cG5ECrI2v2G1aWx25xqiWuvM/Ie7TYH65fWGRVrWJSmlLszAQLmHQ0PqG04Bcv26hjUP2vg1l1J/pI1IUCnlLNRXB2WIP0ONgsRhri7RysO8NoX4vysIas057cZcWC03FMN9GMoihY=[/tex]             [tex=13.429x1.571]KUCtGY07BCqBjm68XvZm/TceWTSFWpgg8vM5awyeaUcaIuTThM+17tM5c4F8Lr5WsdbeUrP1NMYwPBvH1sJ1Yg==[/tex][tex=5.071x1.357]BDgUYrhJ9qbtADdBsptFrobcgQvfyPz9q2+drNQNi+E=[/tex]                [tex=11.071x1.571]fT1rEaEWC1mLHKIe5tl2bY51o3+gADalYElOXtLdECwPs8jw7LQiOXZr83Lfv6L+[/tex] .

    举一反三

    内容

    • 0

      求解下列矩阵对策,其中赢得矩阵 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 为$\left[\begin{array}{llll}2 & 7 & 2 & 1 \\ 2 & 2 & 3 & 4 \\ 3 & 5 & 4 & 4 \\ 2 & 3 & 1 & 6\end{array}\right]$

    • 1

      设随机变量X的分布律为P{X=-1}=1/6, P{X=0}=1/3, P{X=1/2}=1/6, P{X=1}=1/12, P{X=2}=1/4, 则E(X²)= ( ). A: 1/3 B: 2/3 C: 31/24 D: 4/3

    • 2

      已知3阶矩阵A与3维列向量 x 满足[tex=6.857x1.357]zd0nq0IiNsY0hFTyLJHQy4eC+A8zUY14VqChcVve0aM=[/tex],且向量组[tex=0.714x0.786]Qp78QkdFrqytlOsANWrP9w==[/tex],[tex=3.5x1.429]c2YtesCJSYo0KOSy0rMECg==[/tex] (1)记[tex=10.643x1.357]3tyZrBE07WCx0ZFK2Y3aVjbjYUrJ/5Q0lIjkUE1dgc8=[/tex],求三阶矩阵B,使AP= PB;(2)求[tex=1.357x1.357]0awZUhfhOcjHk6LSkdT6Gw==[/tex]

    • 3

      6个顶点11条边的所有非同构的连通的简单非平面图有[tex=2.143x2.429]iP+B62/T05A6ZTM0eeaWiQ==[/tex]个,其中有[tex=2.143x2.429]ndZSw3zT0QTOVLVdoUto1Q==[/tex]个含子图[tex=1.786x1.286]J+vVZa2YaMpc6mJBbqVvWw==[/tex],有[tex=2.143x2.429]lmhx48evnQMhi03NovPXig==[/tex]个含与[tex=1.214x1.214]kFXZ1uR8GjycbJx+Ts2kyQ==[/tex]同胚的子图。供选择的答案[tex=3.071x1.214]3KinXFh3SXhZ7nIe1y9KEV6aadxhhJWeEy6Dij1iObdMUZkY6ZA5J2dVVjPSuhEf[/tex]:(1) 1 ;(2) 2 ;(3) 3 ; (4) 4 ;(5) 5 ;(6) 6 ; (7) 7 ; (8) 8 。

    • 4

      已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}