It's a beautiful toy, ____? [ ] A. is it 发布时间:2017-06-30 13:30 │ 来源:www.tikuol.com 题型:选择题 问题: It's a beautiful toy, ____? [ ]A. is it B. isn't it C. has it D. doesn't
题型:选择题 A是n阶矩阵,|A|=0的充分必要条件是: (1) Ax=0有非零解; (2) Ax=b有无穷多解; (3) A的列向量组中任何一个向量可被其余n-1个向量线性表出; (4) A的特征值全为0; (5) A的行向量组线性相关. 以上结论正确的是( ).A.(1)(2)(3)(5)B.(1)(2)(4)(5)C.(1)(5)D.(1)(2)(5) 查看答案