函数[img=139x26]17de92704a34c07.png[/img] 在点(2,4)处的切线方程为( )
A: y=2
B: y=4
C: x=2
D: x=4
A: y=2
B: y=4
C: x=2
D: x=4
举一反三
- 函数[img=139x26]1802e295592ab9d.png[/img] 在点(2,4)处的切线方程为( ) A: y=2 B: y=4 C: x=2 D: x=4
- 函数[img=139x26]1802e291608dfa3.png[/img] 在点(2,4)处的切线方程为( ) A: y=2 B: y=4 C: x=2 D: x=4
- 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
- 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)
- 由方程x2+xy+y2=4确定y是x的函数,求其曲线上点(2,-2)处的切线方程为y=x-4。()