应用Matlab软件计算行列式[img=110x88]17da5d7b00219d6.png[/img]为( ). A: x^2 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 B: x^3 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 C: x^4 - 6*x^2*y^2 + 8*x*y^3 - 3*y^4 D: x^5- 6*x^2*y^2 + 8*x*y^3 - 3*y^4

已知int x=3,y=4;，写出下列表达式的值 (1) (x,y) (2) x>y?x:y (3) x?y:x (4) (x>y)?(y>=2)?1:2:(y>x)?x:y

已有定义语句:int x=2,y=4,z=6;if(x>y) z=x;x=y;y=z;执行上述语句后x,y,z的值是____。 A: x=4,y=2,z=2 B: x=4,y=4,z=2 C: x=4,y=6,z=6 D: x=4,y=2,z=6

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: $y={{C}_{1}}x+{{C}_{2}}x{{e}^{x}}-(\frac{1}{2}{{x}^{3}}+{{x}^{2}})$

y=arcsin(4x+1)的反函数为 A: y=(sinx-1)/4, x∈R B: y=sin[(x-1)/4], x∈R C: y=sin[(x-1)/4], x∈[-π/2,π/2] D: y=(sinx-1)/4, x∈[-π/2,π/2]

【单选题】若 x - y = 2 , x 2 + y 2 = 4 ,则 x 2020 + y 2020 =() A. 4 B. 2020 2 C. 2 2020 D. 4 2020

若函数$f(x)$具有二阶导数，且$y=f({{x}^{2}})$，则$y'' =$( )。 A: $f'' ({{x}^{2}})$ B: $2f'’ ({{x}^{2}})$ C: $2f’ ({{x}^{2}})+4{{x}^{2}}f’' ({{x}^{2}})$ D: $4{{x}^{2}}f’ ({{x}^{2}})+2f'' ({{x}^{2}})$

函数\(y = {x^{ - 4}}{\rm{ + }}2{x^3} - 2x\)的导数为（ ）. A: \(4{x^3} + 6{x^2} - 2\) B: \( - 4{x^{ - 5}} + 6{x^2} - 2\) C: \( - 4{x^{ - 3}} + 6{x^2} - 2\) D: \( - 4{x^3} + 6{x^2} - 2\)

def function(x): print(x,end=‘ ’) x=4.5 y=3.4 print(y,end=’ ‘)x=2y=4function(x)print(x,end= ‘ ‘)print(y)程序结果是： A: 2 3.4 2 4 B: 2 3.4 4.5 3.4 C: 2 4 2 4 D: 4.5 3.4 2 4

求微分方程[img=143x21]17da5f14490e50e.png[/img]的通解,实验命令为(). A: dsolve(D2y-2*Dy+5*y=sin(2*x),x)ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x) B: dsolve('D2y-2*Dy+5*y=sin(2*x)','x')ans =cos(2*x)*(sin(4*x)/17 - cos(4*x)/68 + 1/4) - sin(2*x)*(cos(4*x)/17 + sin(4*x)/68) + C1*cos(2*x)*exp(x) - C2*sin(2*x)*exp(x) C: dsolve(D2y-2*Dy+5*y=sin(2*x),'x','y')ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x)