• 2022-06-08
    以下哪个Q[x]中的最简分式?()
    A: (x-1)/(x+1)
    B: (x^2+2x)/x^4
    C: (x-1)/(x^2+2)^2
    D: x^5/(x^2-1)
  • C

    内容

    • 0

      求极限lim(x→1)(2/x^2-1)-(1/x-1)

    • 1

      [lncos(x-1)]/[1-sin(πx/2)]x≠1

    • 2

      积分[img=136x52]1803d6afd4e6f95.png[/img]的计算程序和结果是 A: clearsyms xy=1/x^2/sqrt(x^2-1)int(y,x,-2,-1)3^(1/2)/2 B: clearsyms xint(1/x^2/sqrt(x^2-1),x,-2,-1)3^(1/2)/2 C: clearsyms xint(1/x/sqrt(x^2-1),x,-2,-1)-pi/3 D: clearsyms xint(1/x/sqrt(x^2-1),x,-2,-1)3^(1/2)/2 E: clearsyms xint(1/x^2*sqrt(x^2-1),x,-2,-1)log(3^(1/2) + 2) - 3^(1/2)/2

    • 3

      X=[0,1],Y=[1/4,1/2], 构造一个X到Y的双射函数为( ) A: f(x)= (x+1)/4 B: f(x)= (x-1)/4 C: f(x)= (x+1)/2 D: f(x)= (x-1)/2

    • 4

      若f(x-1)=x2(x-1),则f(x)=[]. A: x(x+1)2 B: x(x-1)2 C: x2(x+1) D: x2(x-1)