在图示刚架中,已知 [tex=15.357x1.571]fzGBwJtpZ+YJaGxgKpMmJ3ky0tKfz1i33ckBQwH+Hmld4cA3uRnUPVLfjolQ4KPGr7ZJlh+78gHUwLgmT/1GKg==[/tex],不计刚架自重。求固定端[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 处的约束力。[img=206x252]17963ba38737b37.png[/img]

证明:阶数 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 为整数的贝塞尔函数[tex=14.357x2.643]17mBdzLTve/iDk8BMVTVn0kXhmiNRhlTfMYaR248FWt4ZDFD8K0/fYku9CzTiua/+rP070hMj7yLGc7pQvD1Cggve43h4JC5Swf6TSAZTA9P7Dv2y4WrZFUn8WpN+Gcx[/tex]满足贝塞尔方程[tex=15.357x1.571]H5YwF3Er4aUfC9LBpd4wgtOAezKKU3wqLVIxlNRWa+uWrR7PjrQQHPghKs18kcIASvfcolCcgMwyuPiA+8/zrZArDfv1/ZVM8Hv3yx2fp1Xa042+Oj3jO+g0KGDT083t[/tex]

若 [tex=5.643x1.357]L1oOYW5tn35r5TC0cY2hZA==[/tex] , 证明  [tex=15.357x1.571]GMqNyutdHlCLLt4S19KRVjnhFoFcMXCu98IxPIJIFUN45XijK4m/By0bFL0wIpJ54djOYqwy7ZR03MUdhc2/ZRYznPl+tSN0tqNccKhYgoQ=[/tex]. 特别 [tex=7.143x1.429]2ubNoKI/x6Eye6Xpotfi+0p8l2w0T42du6EjZxX0FKs=[/tex] , 或 [tex=9.0x2.357]pNFrKRjB1difm9b7bQvlHmO6ZmyQG9AqUg6/hldQwzCZOuXgRxt7DoS48Ak9l7fgIenwD+UydHk1joSmTx4keg==[/tex], 并利用此结论，计算下列各式:[tex=5.857x2.429]YLTKJiEouWfpC17s1HRqNRsG1Gdva2CoJcc5WssDku0=[/tex] , 求 [tex=1.643x1.357]QEos0FZVoxidwAY2Qi/JJQ==[/tex].

若 [tex=5.643x1.357]L1oOYW5tn35r5TC0cY2hZA==[/tex] , 证明  [tex=15.357x1.571]GMqNyutdHlCLLt4S19KRVjnhFoFcMXCu98IxPIJIFUN45XijK4m/By0bFL0wIpJ54djOYqwy7ZR03MUdhc2/ZRYznPl+tSN0tqNccKhYgoQ=[/tex]. 特别 [tex=7.143x1.429]2ubNoKI/x6Eye6Xpotfi+0p8l2w0T42du6EjZxX0FKs=[/tex] , 或 [tex=9.0x2.357]pNFrKRjB1difm9b7bQvlHmO6ZmyQG9AqUg6/hldQwzCZOuXgRxt7DoS48Ak9l7fgIenwD+UydHk1joSmTx4keg==[/tex], 并利用此结论，计算下列各式:[tex=9.571x2.786]08wu34PJuLAPcCGdjSeuGAu0BEGi5bHN+pLJ95w+HZVfuRkS7X0HoM07xVFWF/1L[/tex], 求  [tex=1.929x1.357]vmUNP+dKsdI2ZNPnh+kvkQ==[/tex] .

若 [tex=5.643x1.357]L1oOYW5tn35r5TC0cY2hZA==[/tex] , 证明  [tex=15.357x1.571]GMqNyutdHlCLLt4S19KRVjnhFoFcMXCu98IxPIJIFUN45XijK4m/By0bFL0wIpJ54djOYqwy7ZR03MUdhc2/ZRYznPl+tSN0tqNccKhYgoQ=[/tex]. 特别 [tex=7.143x1.429]2ubNoKI/x6Eye6Xpotfi+0p8l2w0T42du6EjZxX0FKs=[/tex] , 或 [tex=9.0x2.357]pNFrKRjB1difm9b7bQvlHmO6ZmyQG9AqUg6/hldQwzCZOuXgRxt7DoS48Ak9l7fgIenwD+UydHk1joSmTx4keg==[/tex], 并利用此结论，计算下列各式:[tex=9.571x2.786]OVuxQeDmlToIZWeG7YyrrH9rrVR6fmtFLaNIivb4DnISIUSOmitWUiOVDDbFOKSL[/tex], 求  [tex=1.929x1.357]vmUNP+dKsdI2ZNPnh+kvkQ==[/tex].

若 [tex=5.643x1.357]L1oOYW5tn35r5TC0cY2hZA==[/tex] , 证明  [tex=15.357x1.571]GMqNyutdHlCLLt4S19KRVjnhFoFcMXCu98IxPIJIFUN45XijK4m/By0bFL0wIpJ54djOYqwy7ZR03MUdhc2/ZRYznPl+tSN0tqNccKhYgoQ=[/tex]. 特别 [tex=7.143x1.429]2ubNoKI/x6Eye6Xpotfi+0p8l2w0T42du6EjZxX0FKs=[/tex] , 或 [tex=9.0x2.357]pNFrKRjB1difm9b7bQvlHmO6ZmyQG9AqUg6/hldQwzCZOuXgRxt7DoS48Ak9l7fgIenwD+UydHk1joSmTx4keg==[/tex], 并利用此结论，计算下列各式:[tex=6.857x1.5]kVVyVLWMfMkaQZyWtOltBwsp5pagHEFuBvsNJ/Stimw=[/tex], 求  [tex=1.929x1.357]vmUNP+dKsdI2ZNPnh+kvkQ==[/tex].

下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}

以下谓词蕴含式正确的是（）: (∀x) (A(x)→B(x))=>( ∀x)A(x)→(∀x)B(x)|(∀x) (A(x)↔B(x))=>( ∀x)A(x)↔(∀x)B(x)|(∀x)A(x)∨(∀x)B(x)=>( ∀x) (A(x)∨B(x))|(∃x) (A(x)∧B(x))=>(∃x)A(x)∧(∃x)B(x)

以下谓词蕴含式正确的是（）: (?x) (A(x)→B(x))=>( ?x)A(x)→(?x)B(x)|(?x) (A(x)?B(x))=>( ?x)A(x)?(?x)B(x)|(?x)A(x)∨(?x)B(x)=>( ?x) (A(x)∨B(x))|(?x) (A(x)∧B(x))=>(?x)A(x)∧(?x)B(x)

下列式中错误的是： A: (∀x)(A(x)Úp(x)) Û (∀x)A(x)Ú (∀x)p(x) B: ($x)A(x) Ù p Û ($x)(A(x) Ù p ) C: (∀x)(A(x)ÚB(x)) Þ (∀x)A(x)Ú( ∀x)B(x) D: ($x)(A(x)ÙB(x)) Þ ($x)A(x)Ù( $x)B(x)