下述行列式是x的几次多项式?分别求出x^4项和x^3项的系数:-|||-5x x 1 x-|||-1 x 1 -x-|||-3 2 x 1-|||-3 1 1 x

|3 5 x-|||-|2 3 8-|||-行列式 1 2 1 =0,则 x=-9 。

13.-|||-多项式 ((x)_(1),(x)_(2),(x)_(3))=(({x)_(1)+(x)_(2))}^2+(({x)_(1)+(x)_(3))}^

若多项式(x)=(x)^4+(x)^3-3(x)^2-4x-1 和 (x)=(x)^3+(x)^2-x-1，则f(x)和g(x)的公因式为（）。A、x+1B、x

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

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

极限 lim _(xarrow 0)dfrac ({(2+cos x))^x-(3)^x}((1-sqrt {1-{x)^2})ln (1+} 为() ()

已知非齐次线性方程组 ) (x)_(1)+(x)_(2)+(x)_(3)+(x)_(4)=-1 4(x)_(1)+3(x)_(2)+5(x)_(3)-(x)_

已知非齐次线性方程组 |} (x)_(1)+(x)_(2)+(x)_(3)+(x)_(4)=-1 4(x)_(1)+3(x)_(2)+5(x)_(3)-(x)_

线性方程组 ) -(x)_(1)+3(x)_(2)=1 2(x)_(1)-8(x)_(2)=-3= __-|||-注:直接填写行列式的值。

解线性方程组_(1)-2(x)_(2)+(x)_(3)=-2-|||-__ __-|||-(x)_(1)+(x)_(2)-3(x)_(3)=1-|||--(x)