设[img=32x21]17da40e4dc047df.png[/img]为[img=13x15]17da4671a1278b4.png[/img]阶方阵,[img=16x17]17da5b42161234b.png[/img]为[img=13x15]17da4671a1278b4.png[/img]阶单位阵,则以下命题中正确的是( )
未知类型:{'options': ['', ' [img=171x24]17da6202d3dc2b2.png[/img]', ' [img=168x24]17da6202eb71eaf.png[/img]', ' [img=95x24]17da6202fdabf70.png[/img]'], 'type': 102}
未知类型:{'options': ['', ' [img=171x24]17da6202d3dc2b2.png[/img]', ' [img=168x24]17da6202eb71eaf.png[/img]', ' [img=95x24]17da6202fdabf70.png[/img]'], 'type': 102}
举一反三
- 设[img=16x17]17da4671aa65448.png[/img],[img=16x17]17da467268bf781.png[/img]为[img=13x15]17da4671a1278b4.png[/img]阶方阵,[img=16x17]17da5b42161234b.png[/img]为[img=13x15]17da4671a1278b4.png[/img]阶单位阵,则以下命题中正确的是 未知类型:{'options': ['', ' [img=163x24]17da6137466c16a.png[/img]', ' [img=92x24]17da40e5524c74a.png[/img]', ' [img=165x24]17da613767938ec.png[/img]'], 'type': 102}
- 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))
- 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
- 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)
- 设[img=16x17]17da4671aa65448.png[/img],[img=16x17]17da467268bf781.png[/img]为[img=13x15]17da4671a1278b4.png[/img]阶方阵,k为一实数,则以下命题中错误的是 未知类型:{'options': ['', ' [img=125x24]17da613599233d6.png[/img]', ' [img=80x24]17da6135b09bc89.png[/img]', ' [img=96x24]17da51a6bd241ac.png[/img]'], 'type': 102}