线性代数拔尖线性代数随机推荐线性代数做题本（一）解答版选择题线性方程组不看本题本题讨论已掌握查看解析收入错题#8517设 Pi(xi,yi){P}_{i}\left({{x}_{i},{y}_{i}}\right)Pi(xi,yi)， i=1,2,3\mathrm{i} = 1,2,3i=1,2,3 为平面上三个不同的点，又 A=(x1y11x2y21x3y31)A = \left(\begin{array}{lll} {x}_{1} & {y}_{1} & 1 \\ {x}_{2} & {y}_{2} & 1 \\ {x}_{3} & {y}_{3} & 1 \end{array}\right)A=x1x2x3y1y2y3111，则三点 P1{P}_{1}P1， P2{P}_{2}P2，另在同一条直线上的充分必要条件是‾\underline{\qquad}.A. r(A)=1r\left(A\right) = 1r(A)=1B. r(A)=2r\left(A\right) = 2r(A)=2C. ∣A∣=0\left| A\right| = 0∣A∣=0D. ∣A∣≠0\left| A\right| \neq 0∣A∣=0