• 2022-05-30
    计算(x-1)(x+1)=____(x-1)(x^2+x+1)=_____(x-1)(x^3+x^2+x+1)=_____.
  • 1x^2-12x^3-13x^4-14x^5-15x^n-1

    内容

    • 0

      【单选题】若f(x- 1)= x 2 (x-1),则f(x) =(). A. x(x+ 1) 2 B. x(x- 1) 2 C. x 2 (x+1) D. x 2 (x- 1)

    • 1

      lim(x→∞)(1-1/(x+1))^(-x-1)=lim(x→∞)(1/(x+1))^(-x-1)lim(x→∞)(1-1/(x+1))^(x+1)

    • 2

      已知X+1/X=1,求X-1/X=?

    • 3

      证明:如果(x^2+x+1)lf1(x^3)+xf2(x^3),那么(x-1)lf1(x),(x-1)lf2(x)

    • 4

      不等式(x+2)(x-1)>0的解集为 A: {x|x<-2或x>1} B: {x|-2<x<1} C: {x|x<-1或x>2} D: {x|-1<x<2}