用傅里叶积分表示下列函数：[tex=9.643x3.357]ACpG7W/lXiEwdW69ASBj8z1DJ9cHYsnF6DhontRBX5qkLihRjn9eqf7Hb2y3J3dcArr1XVZniLjPgcuFvvlEXALy8atxwX8hnyAQUjI93wQ=[/tex]

设 [tex=9.643x3.357]ACpG7W/lXiEwdW69ASBj8zLd8wytShowCGMrNp1HsFqGXlHdrht0f1EBoAJfEq1Xzpge/96h2Qyrasvw1PFqp3FKIOCqOOG8lSelPNs+KAe4YtCKjCaJrdK0fveownf2[/tex]在点 [tex=1.857x1.0]fwov+ZzREJJP/GTCJbKvrw==[/tex] 处可导,求 [tex=1.286x1.214]rkgrF+YaaESwSQDjR6KfWg==[/tex] 的值.

设[tex=9.643x3.357]ACpG7W/lXiEwdW69ASBj8z1DJ9cHYsnF6DhontRBX5qkLihRjn9eqf7Hb2y3J3dcH25PWpjTfqlI1wVyQLyVEpvuYLiMlDogvk35RT+LBI0=[/tex]则[tex=5.214x1.357]VRTvz6IuORTPL9eOuWVKGw==[/tex] 未知类型：{'options': ['0', '1', '[tex=6.571x3.357]7EJHVCtO2IWq3KpdB+jQsqLn5HoaSDznyXpWoOQKTZmlSTA1UWF/ZaROoyeXL6MjDWeDaM5C63nCLbmHWYCExvlLPsAfgY0fVGwawUCu27s=[/tex]', '[tex=6.571x3.357]7EJHVCtO2IWq3KpdB+jQsqLn5HoaSDznyXpWoOQKTZmVzDEKQwP9HpY/uN4treCV0cXLzwiCSn/ATS/2MQWZG8KiU0IgExA0pGtbvHRvYfU=[/tex]'], 'type': 102}

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

下列函数可作为概率密度函数的是(    ). 未知类型：{'options': ['[tex=8.214x1.571]H5EiwoWaq5obgbYjjKtYr8/uRN7rdZ3Sz+xuqzhFKE4=[/tex]', '[tex=10.429x2.643]19bEwRx45yE5ncET7WBSn2kxGLPUbE3ppO98oc43OKplzVKiF0F8IzlwYgVa8DPYaZjNtsf3Q+hskGi5XTswIg==[/tex];', '[tex=12.786x4.214]0Oc6OdDyTxw5ASPscCgHyXs9SmRbr4AGeHHA2BFVXYdkpuHQRbYUzaAeOVregXjCoSwWMCmxdzfTWWoe6fhXuQG/XfubUYtQDXc411HW6/uOYLN5o8RvcE8SSe7W1zXwENB35SkRrWuCjandJFAdQmB6oo6qC2J7ZFUlmVKZfek=[/tex]', '[tex=9.643x3.357]0Oc6OdDyTxw5ASPscCgHyeIU6MrP3L2IBaIAkA0W1RUIsXUcFE2wBOn43EH2/9pw+DpP0f2M/5ASwnkudK8PL8jdXcbAzAELmGg6Xan8DnGdvgGXK2H4SRkaq9FH8WGO[/tex]'], 'type': 102}

求下面方程组所确定的函数的导数或偏导数或全微分：[br][/br][tex=9.643x3.357]fnpmC2J6JmQBLyo5NmGAz53mVfHTw3lrPWlgeBlc/opwiKmPOFkS0NeMAtX1uaeCM+J9tQToOBLqn+IzZqbZZYeELKbPGHa7Ei4xsxbTn+IWaEDz27oX4xV9ehxQRWvlgwXv8U9NkoUj8TWLzK2cyg==[/tex]求[tex=1.286x2.071]V9fVXReHUrcmKJSTnoNlS4pPCcFzGX2BzyuRX+4Qz+ONExfXEdhUsft/qOY5isgS[/tex]，[tex=1.286x2.071]V9fVXReHUrcmKJSTnoNlS9cRk/b7JOietG/SuQgrH932nWDpG06jgW5LvHOJx2aj[/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)