已知函数y=[img=22x17]17e0a6f62289097.jpg[/img], 则y′=().
未知类型:{'options': ['5[img=22x17]17e0a6f62af2c68.jpg[/img]', ' 5[img=22x17]17e0bb738dd90ba.jpg[/img]', ' -5[img=22x17]17e0a6f62af2c68.jpg[/img]', ' -5[img=22x17]17e0bb738dd90ba.jpg[/img]'], 'type': 102}
未知类型:{'options': ['5[img=22x17]17e0a6f62af2c68.jpg[/img]', ' 5[img=22x17]17e0bb738dd90ba.jpg[/img]', ' -5[img=22x17]17e0a6f62af2c68.jpg[/img]', ' -5[img=22x17]17e0bb738dd90ba.jpg[/img]'], 'type': 102}
举一反三
- 已知函数y=[img=22x17]17e44511f8743d2.jpg[/img], 则y′=(). 未知类型:{'options': ['5[img=22x17]17e445120362a41.jpg[/img]', ' 5[img=22x17]17e445120d9d01d.jpg[/img]', ' -5[img=22x17]17e445120362a41.jpg[/img]', ' -5[img=22x17]17e445120d9d01d.jpg[/img]'], 'type': 102}
- 已知随机变量X的分布列如下:[img=386x130]17e43ec4c459e73.png[/img],则E(X)= A: 17/30 B: m未知,无法求出 C: -30/17 D: -17/30
- 3. 三阶行列式D=[img=110x71]18039d1f1b55d53.png[/img]= A: 5 B: 17 C: 22 D: 7
- 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)
- 求不定积分[img=132x48]17da6537fc8dad6.png[/img]; ( ) A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))