设波动方程定解问题为[img=302x93]1803bcc94b25a15.png[/img]记L[u(x,t)]=U(x,s),对泛定方程关于t作拉普拉斯变换，则U(x,s)满足
A: [img=208x47]1803bcc9562fac3.png[/img]
B: [img=224x47]1803bcc960dd81c.png[/img]
C: [img=224x47]1803bcc96b5f386.png[/img]
D: [img=208x47]1803bcc97535641.png[/img]
E: [img=222x47]1803bcc97eba38d.png[/img]
F: [img=208x47]1803bcc988a8f0d.png[/img]
A: [img=208x47]1803bcc9562fac3.png[/img]
B: [img=224x47]1803bcc960dd81c.png[/img]
C: [img=224x47]1803bcc96b5f386.png[/img]
D: [img=208x47]1803bcc97535641.png[/img]
E: [img=222x47]1803bcc97eba38d.png[/img]
F: [img=208x47]1803bcc988a8f0d.png[/img]
举一反三
- 设初边值问题[img=318x93]1803bcc98a7fc09.png[/img]对泛定方程关于t作拉普拉斯变换，记L[u(x,t)]=U(x,s),则 A: [img=215x47]1803bcc9954fe40.png[/img] B: [img=184x47]1803bcc99f14872.png[/img] C: [img=215x47]1803bcc9a96c286.png[/img] D: [img=198x47]1803bcc9b4a101f.png[/img] E: [img=174x47]1803bcc9bf071c5.png[/img] F: [img=214x47]1803bcc9ca17ae7.png[/img] G: [img=222x47]1803bcc9d4d322b.png[/img]
- 设定解问题[img=215x85]1803bcc9d59e2a2.png[/img]选择对y进行拉普拉斯变换。令L[u(x,y)]=U(x,s),则方程变为 A: [img=191x44]1803bcc9e189988.png[/img] B: [img=181x44]1803bcc9ed5ac09.png[/img] C: [img=205x44]1803bcc9f77f95a.png[/img] D: [img=203x44]1803bcca00c1a63.png[/img] E: [img=184x44]1803bcca085876e.png[/img] F: [img=174x44]1803bcca130003a.png[/img]
- 若f(x)+f(-x)=0, 则[img=95x39]17da608af452d96.jpg[/img]. 若f(x)=f(-x), 则 [img=170x38]17da60541207426.jpg[/img]
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 设X~U(a,b), a>;0,E(X)=3, D(X)=[img=15x41]17e438378e5b7d7.png[/img], 则P(1<;X<;3)=____。