4.已知实数x满足x^2+(1)/(x^2)-3x-(3)/(x)+2=0.求x^3+(1)/(x^3)的值.

已知实数x满足(x)^2+dfrac (1)({x)^2}-3x-dfrac (3)(x)+2=0，求(x)^3+dfrac (1)({x)^3}的值.已知实数

x .-m -1 O-|||--x m 1 =(a)_(4)(x)^4+(a)_(3)(x)^3+(a)_(2)(x)^2+(a)_(1)x+(a)_(0) ,

函数(x)=(x)^3+(x)^2-x-1的单调递减区间为（ ）(x)=(x)^3+(x)^2-x-1(x)=(x)^3+(x)^2-x-1(x)=(x)

[题目]-|||-证明:-|||-x -1 0 0-|||-0 x -1 0 =(a)_(3)(x)^3+(a)_(2)(x)^2+(a)_(1)x+(a)_(

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

求线性方程组_(1)+(x)_(2)+(x)_(3)+(x)_(4)=0-|||-_(2)+2(x)_(3)+2(x)_(4)=1-|||-_(1)+2(x)_

4.已知两个线性变换:-|||- ) (y)_(1)=(x)_(1)+2(x)_(2)+3(x)_(3) (y)_(2)=-(x)_(1)+3(x)_(2)-

已知函数(x)=2(x)^3+(x)^2+2x-1定义在区间[-1,1]上,在空间(x)=2(x)^3+(x)^2+2x-1上求函数(x)=2(x)^3+(x)

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

1.已知方程组 ) (x)_(1)+(x)_(2)+(x)_(3)+(x)_(4)=2 3(x)_(1)+2(x)_(2)+(x)_(3)+(x)_(4)=a