1)计算并观察下列各式:(x-1)(x+1)= ;(x-1)(x2+x+1)= ;(x-1)(x3+x2+x+1)= ;
观察下列各式:(x-1)(x+1)=x2-1 &n
化简并求值:3x3-[x3+(6x2-7x)]-2(x3-3x2-4x)其中x=-1.
若x3-6x2+11x-6=(x-1)(x2+mx+n),求:
若x2+x-1=0,则2x3+3x2-x( )
阅读以下内容:(x-1)(x+1)=x2-1,(x-1)(x2+x+1)=x3-1,(x-1)(x3+x2+x+1)=x
观察下列各式:(x-1)(x+1)=xˆ2-1 (x-1)(xˆ2+x+1)=xˆ3-1
观察下列各式(x-1)(x+1)=x的平方-1 (x-1)(X的平方+x+1)=x的三次方-1
证明:(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值与x无关.
求 F(x)=X2-1/X2+x-1/X 的最小值(X小于0)
分式计算:2x/x2-x-2÷(1-x/x+1)-x2+2x/x2-4
设x1,x2,x3依次是方程log(1/2)x+2=x,log2(x+2)=根号-x,2^x+x=2的实根.
已知x2-x-1=0,则2003+2x-x3的值是( )