化简分式[img=229x50]1803072e13a5b44.png[/img]可以使用
A: Together[1/(x+1)-((x+3)/(x^2-1))(x^2-2x+1)/(x^2+4x+3)]
B: Simplify[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
C: Reduce[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
D: Apart[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
A: Together[1/(x+1)-((x+3)/(x^2-1))(x^2-2x+1)/(x^2+4x+3)]
B: Simplify[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
C: Reduce[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
D: Apart[1⁄(x+1)-((x+3)⁄(x^2-1))((x^2-2x+1)⁄(x^2+4x+3))]
举一反三
- 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
- 求方程组的解，取初值为（1，1，1）。[img=250x164]180333307ab8fde.jpg[/img] A: f=@(x) [x(1)^3+x(2)-x(3)-5; 2*x(1)+3*x(2)^2-6; x(1)+x(2)+x(3)-3];x=fsolve(f,[1,1,1],optimset('Display','off')) B: x=fsolve(@(x) [x(1)^3+x(2)-x(3)-5; 2*x(1)+3*x(2)^2-6; x(1)+x(2)+x(3)-3],[1,1,1]) C: f=@(x) [x(1)^3+x(2)-x(3)-5; 2*x(1)+3*x(2)^2-6; x(1)+x(2)+x(3)-3];x=fzero(f,[1,1,1]) D: x=fzero(@(x) [x(1)^3+x(2)-x(3)-5; 2*x(1)+3*x(2)^2-6; x(1)+x(2)+x(3)-3],[1,1,1])
- 已知集合A={x|(x+1)(x-3)＜0}，B=|x||x|＞2}，则A∩B等于______。 A: {x|-2＜x＜-1} B: {x|-1＜x＜2} C: {x|2＜x＜3} D: {x|-2＜x＜3}
- 方程${{x}^{2}}{{y}^{''}}-(x+2)(x{{y}^{'}}-y)={{x}^{4}}$的通解是( ) A: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$ B: $y={{C}_{1}}x+{{C}_{2}}{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ C: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{4}})$ D: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$
- 设A={x|-1<x<2},B={x|1<x<3},求A∪B. A: {x|-1<x<2} B: {x|-1<x<1} C: {x|-1<x<3} D: {x|2<x<3}