• 2022-06-05
    设[img=35x23]1803c276a4ae0c6.png[/img]均为可逆矩阵,则分块矩阵[img=70x51]1803c276ad52535.png[/img]的伴随矩阵为( )
    A: [img=84x51]1803c276b5b7872.png[/img]
    B: [img=133x61]1803c276c14e915.png[/img]
    C: [img=160x61]1803c276cb50314.png[/img]
    D: [img=133x61]1803c276d5ade7e.png[/img]
  • D

    举一反三

    内容

    • 0

      独立重复地投掷一颗均匀的骰子,直到出现6点就停止投掷,设X表示投掷骰子的次数,则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da175d21bb3.png[/img][img=36x43]1803da176510759.png[/img][img=57x43]1803da176e34ee6.png[/img]…[img=58x43]1803da177747ce7.png[/img]… D: X123…k…P[img=9x43]1803da177fbaa74.png[/img][img=36x43]1803da17890c39f.png[/img][img=57x43]1803da1792a9c56.png[/img]…[img=58x43]1803da179bd7a28.png[/img]…

    • 1

      ​设 [img=35x23]18032f261c816df.png[/img] 均为二阶方阵, [img=49x24]18032f26254a73c.png[/img] 分别是 [img=35x23]18032f261c816df.png[/img] 的伴随矩阵, 若 [img=106x25]18032f2635853a6.png[/img] 则分块矩阵 [img=70x51]18032f263e425c9.png[/img] 的伴随矩阵为‍ A: [img=107x51]18032f26497736c.png[/img] B: [img=107x51]18032f26545b568.png[/img] C: [img=107x51]18032f265f21a25.png[/img] D: [img=107x51]18032f2668f821d.png[/img]

    • 2

      如图所示稳压管稳压电路中,已知稳压管的稳定电压[img=28x26]17d60cd30a1a586.png[/img]=6V,最小稳定电流[img=52x26]17d60cd31816f65.png[/img]=5mA,最大稳定电流[img=55x26]17d60cd32485553.png[/img]=25mA,负载电阻[img=27x26]17d60cd32f6d59a.png[/img]=600[img=20x19]17d60cd33b656d3.png[/img]。则限流电阻R的取值范围是( )[img=28x19]17d60cd3471e408.png[/img]。[img=560x340]17d60cd353b140c.png[/img] A: 141~267 B: 141~276 C: 114~276 D: 114~267

    • 3

      已知矩阵[img=126x63]18034a7cde5633e.png[/img]相似于矩阵[img=142x71]18034a7ce8de7be.png[/img],则 A: x=-2, y=-1 B: x=2, y=-1 C: x=1,y=-2 D: x=-1,y=-2

    • 4

      设矩阵[img=98x51]1802e4e07fdae52.png[/img],[img=112x51]1802e4e08c993f8.png[/img],则满足矩阵方程X+AX=B的矩阵X是: A: [img=156x51]1802e4e0970c977.png[/img] B: [img=156x51]1802e4e0a1c617c.png[/img] C: [img=156x51]1802e4e0ab7a1af.png[/img] D: [img=156x51]1802e4e0b6f3626.png[/img]