Giải hệ phương trình tuyến tính (left{ begin{array}{l}

2mathop xnolimits_1 – mathop xnolimits_2 + 3mathop xnolimits_3 + 4mathop xnolimits_4 = 5\

mathop {4x}nolimits_1 – 2mathop xnolimits_2 + 5mathop xnolimits_3 + 6mathop xnolimits_4 = 7\

6mathop xnolimits_1 – mathop {3x}nolimits_2 + 7mathop xnolimits_3 + 8mathop xnolimits_4 = 9\

3mathop xnolimits_1 – 4mathop xnolimits_2 + mathop {9x}nolimits_3 + 10mathop xnolimits_4 = 11

end{array} right.)

A. (mathop xnolimits_1 = 1,mathop xnolimits_2 = 3 – 2mathop xnolimits_4 mathop {,x}nolimits_3 = 4 – 2mathop xnolimits_4 )

B. (mathop xnolimits_1 = 0,mathop xnolimits_2 = 4 – 2mathop xnolimits_4 mathop {,x}nolimits_3 = 3 – 2mathop xnolimits_4 ) 

C. (mathop xnolimits_1 = 1,mathop xnolimits_2 = 3 – 2mathop xnolimits_3 mathop {,x}nolimits_3 = 4 + 2mathop xnolimits_3)

D. (mathop xnolimits_1 = 3 + 5mathop xnolimits_4 ,mathop xnolimits_2 = 4mathop {,x}nolimits_3 = 3 – mathop xnolimits_4)

Hướng dẫn

Chọn B là đáp án đúng