立方体尺寸和受力如图[tex=1.786x1.0]D1B2Cgq8PtBET+1p7ztRGA==[/tex]所示,[tex=16.071x1.286]hkICLCX7hfM8cxe8AHA/zgCLu5F+/RBRxqngaySKp37ddwuzuFQ7p0mzYzNPUK48[/tex].试求。三个力分别在[tex=3.5x1.286]f6eRXjGEObz1nyO9aAbMDw==[/tex]轴上的投影:[img=196x177]17d0305d25e8819.png[/img]
[tex=23.357x20.929]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[/tex]
举一反三
- 【单选题】设X为连续型随机变量, 其概率密度: f(x)=Ax2, x∈(0,2); 其它为0. 求(1)A=(); (2) 分布函数F(x)=(); (3) P{1<X<2} (10.0分) A. (1)3/8; (2)x<0, F(x)=0; 0≤x<2, F(x)=1/8x³; x≥2, F(x)=1; (3) 7/8 B. (1)5/8; (2)x<0, F(x)=0; 0≤x<2, F(x)=1/8x³; x≥2, F(x)=0 (3) 1/8
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 6个顶点11条边的所有非同构的连通的简单非平面图有[tex=2.143x2.429]iP+B62/T05A6ZTM0eeaWiQ==[/tex]个,其中有[tex=2.143x2.429]ndZSw3zT0QTOVLVdoUto1Q==[/tex]个含子图[tex=1.786x1.286]J+vVZa2YaMpc6mJBbqVvWw==[/tex],有[tex=2.143x2.429]lmhx48evnQMhi03NovPXig==[/tex]个含与[tex=1.214x1.214]kFXZ1uR8GjycbJx+Ts2kyQ==[/tex]同胚的子图。供选择的答案[tex=3.071x1.214]3KinXFh3SXhZ7nIe1y9KEV6aadxhhJWeEy6Dij1iObdMUZkY6ZA5J2dVVjPSuhEf[/tex]:(1) 1 ;(2) 2 ;(3) 3 ; (4) 4 ;(5) 5 ;(6) 6 ; (7) 7 ; (8) 8 。
- 设随机变量(X,Y)的概率分布列为[img=345x154]178ab1c9ce3bc1b.png[/img]求[tex=1.571x1.0]JUrGU6ftUjxQCIr6CyfDwQ==[/tex],[tex=1.357x1.0]yL/7/hhyqgwzAX8jnIq3OQ==[/tex],[tex=4.357x1.357]LN0xwhQHSOeLwBClUlpHQw==[/tex].
- 设随机变量X的密度函数为[img=572x74]1791bc8f97085d2.jpg[/img]试求:(1)常数A;(2)[tex=6.714x1.357]AyFmD19eLybEpNdIrC346g==[/tex]
内容
- 0
已知随机变量X~B(n,1/2),且P{X=5}=1/32,则n=___________ A: 5 B: 6 C: 7 D: 8
- 1
求如图题 8-8 所示结构[tex=1.357x1.214]YnR7qSUKxz+0Bvkd2jgfuQ==[/tex] 的影响线,荷载 P=1 沿 A D F G 移动[img=283x192]179f3ce4c4c5167.png[/img]
- 2
设f(x)具有性质:[tex=8.571x1.357]8gPeznjMnng12qtkk9Vgczii1Sh4d1qJxc9iHYT5+YI=[/tex]证明:必有f(0)=0,[tex=5.5x1.357]rt5qCY7TXHcsFUQrD44nPA==[/tex](p为任意正整数)
- 3
对 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]的不同值,分别求出循环群[tex=1.143x1.214]StMMJ6qThnpokZJIPGrdFyP3vrLnUdltYxmLxjw8za8=[/tex]的所有生成元和所有子群。(1) 7; (2) 8; (3)10 ;(4) 14 ; (5) 15 (6) 18 。
- 4
\(二次型f(x)=x^{T}\begin{bmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{bmatrix}x的秩为\)