设有本征值问题[tex=11.429x4.786]7EJHVCtO2IWq3KpdB+jQsjPv+D3fzpJLZMsMh8YUq+KC2EydMefv8cLqaWDm0uKA9h5tQvmzkNc+mPM3yaxMo9XFJXA7jDMJO+pf4xHQXeO39HI2i8kNlxk9Bftv1IVOfOju2PbgPyL9fonziD+OYM9EPYofCeP3NnlmW1JzPIvHKK2PHfyNV69WEgkXdLA7[/tex]试证明:本征值[tex=10.571x3.357]WthkEUtSFemxZK32+NC425lvZD71RPwfC7GxpjXajMYasshEqhlHdmMP4yODdPDswne6O5KUQ2Nql86eaxrops5C4hLGdVylAe+lKYLmhNVnF7pQqhTwEkRUeTnbCjnxQQQaz5shUn1j/G+kZ2soQw==[/tex].

设[tex=10.571x3.357]SLFkQKNSjnyyW4KufuhzQJJeILErtbgqlxGW0BjUXj/vNcLXlZEGOHiCDOGALq+g/5pJFEv0eBIKJcYeUbNgAySbe21LxJ4EiEsWtgwl6FqAC50tsjH8ttd8EEx8kUTPKAOXOBeSv/oJNKBfPXg0k51NbaWnb1zTWwa90eD+/M79s9JbjsaVDdkhHQvPPI7w[/tex] 则 [tex=17.357x3.929]TIwZYBkNsy31H1RNd/OloNb2Aestj0ArrTykIacU0B3nRoLEsKlxZKDOE6Kvmuj2CzajcrsS0b50JlMREoUyGoLP0QaYwdWOePM86hHxXSz8bElcYkCnXEOsaIbd19bb/jNqq8wP5k97hwNnki47TSQvg+34ev/quVMQ/gGoBPT6tne+5TEbTueHZ+sBgUDw9BFg0BkKAEDhsNIi8z7gWY9so+HINCctaJWHXD6Mesc=[/tex] 未知类型：{'options': ['16', '48', '-24', '-8'], 'type': 102}

在下列函数中，当 [tex=0.571x0.786]HXNXn3AXpwdIpZt8+6oCEw==[/tex]取什么值时，函数 [tex=1.857x1.357]bZ4KhrFbnCaidqbMGQZfww==[/tex] 在其定义域内连续?[tex=10.571x3.357]ACpG7W/lXiEwdW69ASBj8zYaIr2wx+7JWz2IzBScsBhv358MdotoH7/5Sgfg/mgGeZsJIJC+rhUzcA164f5LtagBI7F4lYuLadjvRCuB+Fc6dy8grEW0mi5/f5zNU5SSM7nnnyMtqFtHiJANyxyOvg==[/tex]

图示压杆体系中，弹簧支座刚度为[img=64x44]180379b3117202b.png[/img]，则该体系的临界荷载为kl的（ ）倍。[img=3924x1660]180379b32884d13.jpg[/img] A: 0.411 B: 1 C: 1.645 D: 3.357

图示压杆体系中，弹簧支座刚度为[img=64x44]1802df48734317e.png[/img]，则该体系的临界荷载为kl的（ ）倍。[img=3924x1660]1802df4888c0309.jpg[/img] A: 0.411 B: 1 C: 1.645 D: 3.357

若[tex=10.571x3.357]rD0fTcokqUjPlLOdGMIUm1cBoipDHn3Gc9oZ6iJeRu/MC/QFCp4z5dQ3N5QiUiCq3koFdXLy0u86IUr2whWl0B5nxKcCqiJrEuS/cWiKa0gG01z1ZZTKSN25xPz/hDnGWnJ+Vj21DilmcEcbsz/3r5fCqzL7Yb5N8u5gi+TWfW4=[/tex]，[tex=13.0x3.929]dn6tBTY3z1ArPJKgQjSowXDPjsTzdJmV522Cl7N5sBcMSeJT5GHbtoDV9vKefwEDlMFg2L0KODje5Xe1Ukw6k9M9Xkhh/wccTgPh7YGNhyU4h1BJKj4NFREso59skpHJBFMrUz7PU8L6YUax/DaBVo6bY8Cqi1QCq4e6jhiA4lx73zjmdMJm/msaAMZVRobaYxfcHZq1fNL0w0dW49MYmO/JcHr7BfEFYBO7aOBcOt0=[/tex]，则[tex=2.0x1.214]gP4XSr1AB+/lhCbjpv/O+A==[/tex]（    ）。 未知类型：{'options': ['8', '-12', '24', '-24'], 'type': 102}

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)