题目
已知线性方程组 ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .，则系数矩阵 ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .___________________.A ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .B ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .C ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .D ) (x)_(1)+2(x)_(2)-2(x)_(3)+2(x)_(4)-(x)_(5)=0 (x)_(1)+2(x)_(2)-(x)_(3)+3(x)_(4)-2(x)_(5)=0 2(x)_(1) .
已知线性方程组
，则系数矩阵
___________________.
A
B
C
D
题目解答
答案
已知线性方程组，观察该线性方程组的表示可以得到，方程的行数就等于对应的系数矩阵的行数，方程中未知数的数量就是系数矩阵的列数，系数矩阵是一个
矩阵，可以写出来系数矩阵为
。
本题选择D选项。