3(x)_(1)+2(x)_(2)-5(x)_(3)=0 .

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) (x)_(1)+3(x)_(3)geqslant 3 2(x)_(2)+2(x)_(3)geqslant 5 (x)_(1),(x)_(2),(x)_(3)geqslant 0 .

) (x)_(1)+3(x)_(3)geqslant 3 2(x)_(2)+2(x)_(3)geqslant 5 (x)_(1),(x)_(2),(x)_(3)

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  • 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(x)_(3)=0 .

    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)

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    5.线性方程组 ) (x)_(1)-(x)_(2)=(a)_(1) 2(x)_(2)-(x)_(3)=(a)_(2) (x)_(1)+(x)_(2)-(x)

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  • 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)_(3) +(x)_(5)=0 .-

    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)

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  • 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(x)_(2)+(x)_(3)=3 .

    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(

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    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)

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  • 2.解方程组 ) (x)_(1)+(x)_(2)+(x)_(3) (x)_(1)+(x)_(2)-(x)_(3)-(x)_(4)=1 5(x)_(1)+5(x)_(2)-3(x)_(3)-4(x)

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