求下列各式中x的值: (1)x3=0.008; (2)x3-3=; (3)(x-1)3=8.
已知:x+y=1,xy=-3,求下列各式的值:(1)x2+y2; (2)x3+y3; (3)x5y+xy5.
证明:(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值与x无关.
有这样一道题:“计算(2x3-3x2y-2xy2)-(x3-2xy2+y3)+(-x3+3x2y-y3)的值,其中x=1
求下列各式中的x值:(1)121x2=64 (2)3x3-24=0 (3)(5-x)2=(-7)2 (4)-25(2x-
化简并求值:3x3-[x3+(6x2-7x)]-2(x3-3x2-4x)其中x=-1.
求(1+x-x2-x3)5的展开式中x3项的系数,
已知X1/2+X-1/2=3,求(x3/2+x-3/2+2)/(X-1+X+3)的值
根号x+根号1/x=3,求(x2+1/x2-2)/(x3/2+1/x3/2-3)的值
试说明:不论x取何值,代数式(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值恒不
试说明不论x取何值,代数式(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值恒不变
如果3x3-x=1,那么9x4+12x3-3x2-7x+2001的值等于( )
求函数f(x)=2x3-3x+1零点的个数?