求以下定积分可以使用的命令有()。[img=225x88]1802f8c8f4b73be.jpg[/img]
A: 先建立被积函数文件f1.m:function f=f1(x) f=x./(1+abs(cos(x)));再求定积分:integral(@f1,1/exp(1),exp(1))
B: f=@(x) x./(1+abs(cos(x))); q=integral(f,1/exp(1),exp(1))
C: f=@(x) x./(1+abs(cos(x))); q=integral(@f,1/exp(1),exp(1))
D: syms x f=x/(1+abs(cos(x))); s=int(f,x,1/exp(1),exp(1)) eval(s)
A: 先建立被积函数文件f1.m:function f=f1(x) f=x./(1+abs(cos(x)));再求定积分:integral(@f1,1/exp(1),exp(1))
B: f=@(x) x./(1+abs(cos(x))); q=integral(f,1/exp(1),exp(1))
C: f=@(x) x./(1+abs(cos(x))); q=integral(@f,1/exp(1),exp(1))
D: syms x f=x/(1+abs(cos(x))); s=int(f,x,1/exp(1),exp(1)) eval(s)
举一反三
- 求以下定积分可以使用的命令有()。[img=187x84]1802f8c916e3b88.jpg[/img] A: I=integral(@(x) x./(1+abs(cos(x))),1/exp(1),exp(1)) B: f=@(x) x./(1+abs(cos(x))); q=integral(f,1/exp(1),exp(1)) C: f=@(x) x./(1+abs(cos(x))); q=integral(@f,1/exp(1),exp(1)) D: syms xf=x/(1+abs(cos(x)));s=int(f,x,1/exp(1),exp(1))eval(s)
- 设(),求y的4阶导数错误的命令是()A.()syms()f(x)()f(x)=exp(x)*cos(x)()diff(f,4)()B.()syms()f(x)()f(x)=exp(x)*cos(x)()diff(f,x,4)()C.()syms()f(x)()f(x)=exp(x)*cos(x)()diff(f,4,x)()D.()syms()f(x)()f(x)=exp(x)*cos(x)()diff(f,x)
- 求以下定积分可以使用的命令有()。[img=244x89]1802f8c8897092b.jpg[/img] A: syms xfun=x^5*exp(-x)*sin(x);s=int(@fun,x,0,Inf)eval(s) B: syms xfun=x^5*exp(-x)*sin(x);s=int(fun,x,0,Inf)eval(s) C: 先建立被积函数文件fun.m:function f=fun(x)f=x.^5.*exp(-x).*sin(x);再求定积分:integral(@fun,0,Inf) D: fun=@(x) x.^5.*exp(-x).*sin(x);q=integral(fun,0,Inf)
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- 求函数[img=100x33]17da6538782ad77.png[/img]的导数;( ) A: exp((x + 1)^(1/3))/(3*(x + 1)^(2/3)) B: (3*(x + 1)^(2/3)) C: exp((x + 1)^(1/3)) D: exp((x + 1))/(3*(x + 1))