) (x)_(1)+3(x)_(3)geqslant 3 2(x)_(2)+2(x)_(3)geqslant 5 (x)_(1),(x)_(2),(x)_(3)
解方程组: ) (x)_(1)-(x)_(2)-(x)_(3)=2 2(x)_(1)-(x)_(2)-3(x)_(3)=1 3(x)_(1)+2(x)_(2)
5.线性方程组 ) (x)_(1)-(x)_(2)=(a)_(1) 2(x)_(2)-(x)_(3)=(a)_(2) (x)_(1)+(x)_(2)-(x)
求齐次线性方程组-|||- ) 2(x)_(1)+(x)_(2)-(x)_(3)+(x)_(4)-3(x)_(5)=0 (x)_(1)+(x)_(2)-(x)
解下列线性方程组 ) (x)_(1)+2(x)_(2)+3(x)_(3)=1 2(x)_(1)+2(x)_(2)+5(x)_(3)=2 3(x)_(1)+5(
解下列方程:(1)x2+x=0;(2)x2-2√3x=0;(3)3x2-6x=-3;(4)4x2-121=0;(5)3x(2x+1)=4x+2;(6)(x-4)
2.解方程组 ) (x)_(1)+(x)_(2)+(x)_(3) (x)_(1)+(x)_(2)-(x)_(3)-(x)_(4)=1 5(x)_(1)+5(
求齐次线性方程组 ) (x)_(1)+2(x)_(2)+(x)_(3)-(x)_(4)=0 3(x)_(1)+6(x)_(2)-(x)_(3)-3(x)_(4
用消元法解下列线性方程组:-|||- x1+3x2+5x3-4x4 =1, x1+3x2+2x3-2x4+x5=-1, x1-2x2+x3-x4-x5=3, x
某学生解方程3x2-x-2=0的步骤如下:解:3x2-x-2=0→x2-(1)/(3)x-(2)/(3)=0,①→x2-(1)/(3)x=(2)/(3),②→(