设[tex=1.286x1.286]I50z2fChAcmEHzLWd4FfBw==[/tex]为[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶方阵，它的第[tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex]行第[tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex]列元素为1，其余元素均为零(称为单位矩阵).[tex=4.929x1.5]7K89EAiqbgRkVf5frr2x2ygqW4nVKwnbG6VZiW0/w7QE0MGcoWX611apiWzxtXhn[/tex]，计算[tex=2.071x1.286]cw2w8K2vhJuGiF+8HeQyDg==[/tex]，[tex=2.071x1.286]8nfWQ7GYIZeAr9ul/m4M1w==[/tex] , [tex=2.786x1.286]eW/GjfIfHwXlHtmgRst8dOLQ6tlDIwWH8i/sm93/Oco=[/tex]。

2022-06-15

设[tex=1.286x1.286]I50z2fChAcmEHzLWd4FfBw==[/tex]为[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶方阵，它的第[tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex]行第[tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex]列元素为1，其余元素均为零(称为单位矩阵).[tex=4.929x1.5]7K89EAiqbgRkVf5frr2x2ygqW4nVKwnbG6VZiW0/w7QE0MGcoWX611apiWzxtXhn[/tex]，计算[tex=2.071x1.286]cw2w8K2vhJuGiF+8HeQyDg==[/tex]，[tex=2.071x1.286]8nfWQ7GYIZeAr9ul/m4M1w==[/tex] , [tex=2.786x1.286]eW/GjfIfHwXlHtmgRst8dOLQ6tlDIwWH8i/sm93/Oco=[/tex]。

答案：

解[tex=11.5x3.5]iWS+eJWtCPTNieJXORAmFoWcnht7iP4HhlyJHOOH7qXPqj5aihiBH1HHPMbaaeap1rb1Fr4Mb7jR1tx5UPiHExaZ41d6LrSzA0auAo4sW4do2onWYXKOU4Nkyga7+fsICXRNkqlOwR+01gnqNCMpP/m2PJzr5sk9n1S05bl3Bm2R4aBYrH8c3Te25GNCGiAc[/tex][tex=11.786x6.786]YElY1RMOiaAE0qyH+COK8/vdC17UliEwBj1tUBYIdqEXtLyM/w/DJnAcXryv2qOgFG4G5WasNjyHbipCFubMTJFa5fDg2uS9Odjmozdie9/HYEqoqgRtIX0qsjL97itE0/pvqROX8nMNYHB0YqlMPsIbvQcY7b0Xkvd4GVDTDOhiXiYvwnkYZvsAqBU3RQAXQRPzxV0QVNOHAModJ9SDABEU38Ch6oJKD40ctz9fDwQ842XoVg27zLkRJN2PFN82CyCJsx8o4rFKXmgxp4SQ9f3eY+4i+DRGrkro16JFCJk=[/tex][tex=14.5x6.071]YElY1RMOiaAE0qyH+COK8/H5xP82UMzf+VtE9R6Wr0lGAhMqmOkinxUxBDaIhJE5kos+V6Uf8VsEziXal9x1QKF66dDt+r0M2/pBdQff9w8i6q2tKSvGskdTCAoZJ2tqyKMNvpYPNsd3j3E+bsPV5Z0i+iw1d9A++o4xJgidl0DV8uiqLv3yIpbn0ykB82oaeAQqrjk9AxLbltTLsZkUCpiqLGe9orKxiS4W3NkGZJEGfWCW0K3ch/39GIXJJV2+56GUgCZHNvhIjwNl0pmiKPj2vpV14oV5xHXAo0qFb8MGUNoobyoKYCC3zLs+Y7SQ6f55bJP9Bost8BxlQ5XPRQ==[/tex];[tex=13.786x6.786]ZlWhzH7x0R27VWyDh83CjGqK9CdRhkghi0HGH9E/OGXcx7ALH1NL78QaAvH7agvphn3p1cNt3iRmYZvH3h0KaK6/BYz+ZIHmgw0Z47yhk+fS8PY3SxQwCySrKzIECnAd0dANbQSBwwLId/aXhsxEFGcEbHqaDzpFWJ9TepFXqsgnCq90HAvp5SxHxsecpWn6jRfVpMkiulHSBF5MHE0pOCthXNuwpGHXh/g0xPC0tlfx01EkDNDWzuL3M/6zZwqofLdBQVOFlLZkrCERavQ0RbAcINKUr5YsAwtymuIsVOzJH7VBra3pKqJ3kt3B/VQj[/tex][tex=9.5x3.5]jcCMHflCR8OS9TosV6N5vFj2TjRf+ugGPrEY7GF3MZjdUaGmKBJCiZr21IP6nrFCruUjfLu2mc4RbD8724HBulD2/yf+4uvP5wNlQRDIgiTbo5feHMmbEYb72WFlYfgQBkX8XQDKKEltFaUl1ak2eXWtth6ftXOZFHaptehMJ4DLMShBxW/ToUbpznH6OFKA[/tex][tex=11.143x8.214]jcCMHflCR8OS9TosV6N5vBguqlwSz6JuFAgUOTuOFdzq0exBWqSMWtr7Oi4r+ucw6tA3dE0ytOTc02KsLiiPw0efnukxQ1eIBU2c9Sfe0pyAP3NIstySS2aJgLjaOG6HECMlHr9jZtAHyaIt9JveUhVlWAmT2mz9G/BwnaV3LHKkM6v3ehXEy/ttsUqq4Z3xbWy2Nbo27tIm5eJ2u5quox2YShRaogQTLmsDL7EuAFLqATp89DSek17a7XCiCQLQHmvCmnjnaS//Nk0F5wHC6/EwLIwgyOTWzQFkQ4ruP6jd7CVFQlai8X0t3AolBCmw[/tex][tex=6.643x1.286]4iPp74xkSduVmgtxrRCnMTGuIS/m2ysxfhfCF2ZkjAfNkcnhs1vHNKM9i7By5iXE[/tex][tex=10.857x6.714]XmuNnZnzqpOBO9eMOvCv3+o1xTercvmAzL7x8N6IP6YI11Lu8N06ayS6AX8f/vD0ymKU3Qvj6/OhqLQm5N/wVuQ/D5WLp7Mv7EK5wBqr5nXtn40UX9Hu/S2TMOodv3TT9wCzPuEoNZZ51PH0paNZfRf1lSFANLL/BwGQl/3fIYPDkom9tLiBBXhtKeR9K/GJUxchCJVrhYvhX04ZvV1MMx1u5Mmwc1cSu66NFnr2fB2xSq6lTBY7UmoabyKjUEQRgAAEQwI8ggWAgdLs4NwX5gbl60lMFaQHgEr3o+bNK8M=[/tex][tex=10.857x6.786]XmuNnZnzqpOBO9eMOvCv3+o1xTercvmAzL7x8N6IP6YI11Lu8N06ayS6AX8f/vD0ymKU3Qvj6/OhqLQm5N/wVuQ/D5WLp7Mv7EK5wBqr5nXtn40UX9Hu/S2TMOodv3TT9wCzPuEoNZZ51PH0paNZfRf1lSFANLL/BwGQl/3fIYPDkom9tLiBBXhtKeR9K/GJUxchCJVrhYvhX04ZvV1MMx1u5Mmwc1cSu66NFnr2fB2xSq6lTBY7UmoabyKjUEQRgAAEQwI8ggWAgdLs4NwX5vl53LQ0vTPSxcFoPB1jdHE=[/tex][tex=2.5x1.286]AnG/MyFcoi9bLs2aWi/u4Q==[/tex][tex=14.357x6.786]G4+hPMk19386XhOGRQjlYYgRWAiNbAm0C9u8dNDLIwfpbwI5ZbX0/rryT3x8SHsnPZZC7znVSbLIgmxt2ZPhNXPkJ3yn3MF+MXSXaBJe2jgDUm6BIUkkSbfvBu2QZ143CHNnpygRKCPYfKh6GuzAn0w0ptv8ChOKrJmCMWv7N1bWFKSK/xt0gTAkR9KJ2240KrjCQ13C6xWAs3kOo0JIoP/PZtZOXF+iyvKcD4sACjj0Ab9nR3s1U/lgTJ6S7ncxC67riDHFsDmhuNEP9kUxj7QORVgN4PoZuc5JEmb8ct0=[/tex]

举一反三

内容

0
设 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 为 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶可逆矩阵, [tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex] 是由 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 的第 [tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex]行乘以数 [tex=0.571x1.0]rFc/sfAAuCOtzhevhoREeA==[/tex]加到第[tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex] 行得到的矩阵。证明：求 [tex=1.571x1.0]mCjAngcIqtveplNftuY0BQ==[/tex]
1
一辆飞机场的交通车载有 25 名乘客,途经 9 个站,每位乘客都等可能在 9 个站中任意一站下车,交通车只在有乘客下车时才停车,求下列各事件的概率:(1) 交通车在第 [tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex] 站停车;(2) 交通车在第 [tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex] 站和第 [tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex] 站至少有一站停车;(3) 交通车在第 [tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex] 站和第 [tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex] 站均停车;(4) 在第 [tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex] 站有 3 人下车.
2
已知[tex=5.0x1.286]nNRgYScRPw16N2lBJqtTsA==[/tex]，[tex=5.0x1.286]ZIJz5gTGIgdeWAGMFdoL1A==[/tex]，则[tex=6.214x1.286]wE5wtWoL9HR6uGPZrIzvHA==[/tex]成立的[tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex]值为 A: 1 B: 2 C: 4 D: 6 E: 8
3
有容量分别为[tex=3.286x1.286]pCZ+fPe3X5XtlIcXCf6RGw==[/tex]和[tex=3.286x1.286]JjWMjbwalVPPThZBywJsLQ==[/tex]的独立随机样本得到下述观测结果，（X、 Y为观测值， f为频数）X 12.3 12.5 12.8 13.0 13.5 Y 12.2 12.3 13.0f 1 2 4 2 1 f 6 8 2现已知变量X、Y的总体均呈正态分布。请问在0.05的显著性水平下，可否认为这两个总体属同一分布？[tex=24.786x1.286]OVWwFMgiPzBDnRSqBYypUv4puOxaqZVbzeGoYhEt/ZwiQxP0kGgAAWuaJInyBhH09xLkSWqB6n3qd1WXaKpfvwUNfmmVSMJTzi4wz4IT6q4=[/tex][tex=8.429x1.286]AcUD6cTXhAghaQMem3GRbFMfFVpZHcyA3tP0z+S7RAk=[/tex] [tex=13.357x1.357]ZPe8nXNlBeMmW2cEA+D6DaqP/loFbcVH2QukDH1SMofLM6E74nDyl0WrH8imm/Ai[/tex]
4
证明：两个矩阵[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]与[tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex]的乘积的第[tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex]行等于[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]的第[tex=0.357x1.0]O88k7AtkDgTC9kv/8dY0lg==[/tex]行右乘以 [tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex]，第[tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex]列等于[tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex]的第[tex=0.429x1.214]rmIPPJrP+tFN2kAYPlU/4g==[/tex]列左乘以[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]。