线性代数前三章自测题 1.若Dnaija,则Daij(1)na 2. 在五阶行列式中a12a53a41a24a35的符号为= — abccdaac,则A14A24A34A440 3. 设四阶行列式D4cdbdbabd2x11x中x3的系数是=-2 xcdabdcba4.在函数fxxx12abadc5. 四阶行列式bcd= a2b2c2d2 26. 排列i1i2in1in可经nn1次对换后变为排列inin1i2i1. 2111n7. 设A为n阶方阵,A为其伴随矩阵,detA,则detA15A13 431358. 设3阶方阵AO,B24t,且ABO,则t 4 3539. 已知A3E,则A1A2 10. 设A为三阶矩阵,且A1,2A13A125 211111.12210021000121201000 12521205313431613n1100012112. lim0131=000 n0015000x1x2a1xxa23213.线性方程组x3x4a3有解的充要条件是a1a2a3a4a50 xxa445x5x1a514.设A为4阶方阵,且秩RA3,则RA1 0115.矩阵A21001101的秩是=2 201100x1kx2x30316. 齐次线性方程组2x1x2x30只有零解,则k应满足的条件是k. 5kx3x02338642317. A110,ABA2B, 求B。B296 21291233x1x26x34x42x5018. 求解齐次线性方程组2x12x23x35x43x50 x5x6x8x6x023451943414347454Xk11k20k30 010001x1ax2x3319.a、b为何值时,线性方程组x12ax2x34,有唯一解、无解或有无穷多解?xxbx4312在有无穷多解时,求其通解。 当a0且b1时,方程组有唯一解; 当a 其余情形,方程组无解.1且b1时,方程组有无穷多解; 221通解为x2k0,kR. 21 本文来源:https://www.wddqw.com/doc/7dea04312c60ddccda38376baf1ffc4ffe47e29f.html