下面哪一组语句能够完成绘制函数[img=137x26]1803d6af6af20de.png[/img]在区间[img=70x25]1803d6af731b20a.png[/img]上的图形的功能
A: f=’x^3+2*x^2+exp(x)’ezplot(f)
B: f=inline(’x^3+2*x^2+exp(x)’)ezplot(f)
C: x=-2*pi: 0.1:2*piy=x. ^3+2*x. ^2+exp(x)plot(x, y)
D: x=-2pi:0.1:2piy= x^3+2*x^2+exp(x)plot(x,y)
A: f=’x^3+2*x^2+exp(x)’ezplot(f)
B: f=inline(’x^3+2*x^2+exp(x)’)ezplot(f)
C: x=-2*pi: 0.1:2*piy=x. ^3+2*x. ^2+exp(x)plot(x, y)
D: x=-2pi:0.1:2piy= x^3+2*x^2+exp(x)plot(x,y)
举一反三
- 求微分方程[img=372x60]17da65376dc1787.jpg[/img]的通解。 ( ) A: C26*exp(3*x) + (x*exp(3*x)*(x + 1)^2)/2 + C27*x*exp(3*x) - (x^2*exp(3*x)*(2*x + 3))/6 B: C26*exp(3*x) + C27*x*exp(3*x) - (x^2*exp(3*x)*(2*x + 3))/6 C: C26*exp(3*x) + (x*exp(3*x)*(x + 1)^2)/2 D: C27*x*exp(3*x) - (x^2*exp(3*x)*(2*x + 3))/6
- 求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2
- 如下命令可以进行定积分[img=89x72]17e448c768368cc.png[/img]的计算(或近似计算)的是: A: x=1:0.001:2;y=x.*exp(-x.^2);trapz(x,y) B: quad('x.*exp(-x.^2)',1,2,10e-10) C: quad('x*exp(-x^2)',1,2,10e-6) D: syms x;double(int(x*exp(-x^2),x,1,2))
- 求微分方程[img=364x55]17da65386dfd612.png[/img]的通解; ( ) A: - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) B: (3*sin(2*x)*exp(x))/32 - (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) C: - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) D: (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x)
- 用赋值语句给定x的数据,计算[img=520x100]17da65a77d01074.png[/img]对应的matlab语句是( ). A: sqrt(6*tan(3+2*x)+exp(2)*log(3)) B: sqrt(6tan(3+2x)+exp(2)log(3)) C: sqr(6*tan(3+2*x)+exp(2)*log(3)) D: sqr(6tan(3+2x)+exp(2)log(3))