举一反三
- 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)
- 微分方程[img=168x27]18031bb635fcd32.png[/img]的通解是 A: [img=140x44]18031bb63f69124.png[/img] B: [img=171x44]18031bb6484a6f5.png[/img] C: [img=137x43]18031bb651515c6.png[/img] D: [img=154x43]18031bb65ea3286.png[/img]
- 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
- 4. 方程[img=91x71]18039d1f1e873db.png[/img]=0的解为 A: x=1或x=2 B: x=0或x=2 C: x=0或x=1 D: x=0或x=4
内容
- 0
微分方程[img=93x47]1803d34b7aff582.png[/img]通解是( ) A: x + y = c B: [img=88x26]1803d34b83ae917.png[/img] C: [img=82x22]1803d34b8b80242.png[/img] D: [img=97x26]1803d34b94685ca.png[/img]
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函数f(x)=[img=40x76]17e0bf8d391c13e.png[/img]的不连续点为( ) 未知类型:{'options': ['x=0', ' x=[img=43x39]17e0bf8d4513730.png[/img](k=0,±1,±2,…)', ' x=0和x=2kπ(k=0,±1,±2,…)', ' x=0和x=[img=43x39]17e0bf8d4513730.png[/img](k=0,±1,±2,…)'], 'type': 102}
- 2
求解微分方程[img=203x35]17e443a63e2e7ec.png[/img]的通解的命令为: A: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 'x') B: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0') C: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 't') D: dsolve('(x^2-1)*Dy+2*x*y-sin(x)=0', 'y')
- 3
已知微分方程[img=148x26]1803a42fc9f5356.png[/img]的通解为[img=181x26]1803a42fd39d0b4.png[/img]其中,[img=52x23]1803a42fdc56908.png[/img]为任意常数,则[img=40x23]1803a42fe533324.png[/img]依次为: A: 2, 1, 4 B: 1, 0, 1 C: 1, 0, 2 D: 2, 1, 3
- 4
已知微分方程[img=148x26]1803b67ea5910d4.png[/img]的通解为[img=181x26]1803b67eae42eec.png[/img]其中,[img=52x23]1803b67eb7e8bd5.png[/img]为任意常数,则[img=40x23]1803b67ec0fdcea.png[/img]依次为: A: 2, 1, 4 B: 1, 0, 1 C: 1, 0, 2 D: 2, 1, 3