求实数x、y的值，使之满足[tex=14.286x5.214]Uyz5s0rmQIddjb5Jc2T/Yd2OfMe7R8rNwZW05zkWlikeFCsYAQxoPJpDmvsuPxy91FDLgjk/ONs26Vg7K8OwCpILjkajl+I+TN0Z2YXReEuL65oBbGfqQPEPtVJGHAqOP/42eDnypSigg5qE3z+bOwa/RHKXVkPUSBCfecEsh2w=[/tex].

用消元法解下列线性方程组：[tex=14.286x5.214]fnpmC2J6JmQBLyo5NmGAz44k7DRUxlgm384JhSovRDqWmmpuLmZf7KpAsY90JLiUT1HClbiOtywW2Y397KHKKkCGj5mh/MU6w4+CX9cLbOkpXvNPF+NL1Fr//dV4yJ4WBorSTKGpro792tD0EWHXBTf2TseI3dBf+bsfiGfi4Sv74u9w1FK4j+MHvRyq+EZQ/lpCAMMlbJ3wCn3D0/ifAq5xwc9skcXP4Oh0CHUpXIeNDXuFxFGGr2Og0iBWfsYEMAA96OR3kOFTh4dwyHjuHg==[/tex]

按照方案二的效率指标计算，车公里产量为（）吨公里/车公里。 A: 2.758 B: 2.891 C: 4.125 D: 5.214

设 [tex=4.643x1.214]6m6IpLK9nxKlloS9uQjB0nuL8Bfo83HknXeeHZE8fTo=[/tex] 为独立随机变量序列，且均服从参数为 [tex=0.643x1.0]+D9NhKovEP8INGz+KZnr1A==[/tex] 的指数分布，则(     ). 未知类型：{'options': ['[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmIUTBsiC6ukwZloTft28OVE9jW3ut9HI1N9tEOcvkrqVQ9FpF6LmXiNWlCfuJcWQM2wtbxNrFpUsjrl4evwxvNw=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGaIoHn3S0NVRV3Nu374V+dfJfPNpHnR1XUUEhYJLen2ML1zd6RRQ89pjNnVpuxZkjg==[/tex];', '[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmM0otl7/ftYiYbfAmS7OAFjY9VGLkGg7y41mhfVeOp2vppe0YBplmd20NRcHmC8OBZ4e8izzN0cdVws2G8R0XiY=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGXN/tNLTOjhoLpwjnJENMajwP22EU1JR2RzL52wkJVqTc+oZOufkjF9OuDL3/4wwKQ==[/tex].'], 'type': 102}

设 [tex=4.643x1.214]6m6IpLK9nxKlloS9uQjB0nuL8Bfo83HknXeeHZE8fTo=[/tex] 为独立随机变量序列，且均服从参数为 [tex=0.643x1.0]+D9NhKovEP8INGz+KZnr1A==[/tex] 的指数分布，则(     ). 未知类型：{'options': ['[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmIUTBsiC6ukwZloTft28OVE9jW3ut9HI1N9tEOcvkrqVQ9FpF6LmXiNWlCfuJcWQM2wtbxNrFpUsjrl4evwxvNw=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGaIoHn3S0NVRV3Nu374V+dfJfPNpHnR1XUUEhYJLen2ML1zd6RRQ89pjNnVpuxZkjg==[/tex];', '[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmM0otl7/ftYiYbfAmS7OAFjY9VGLkGg7y41mhfVeOp2vppe0YBplmd20NRcHmC8OBZ4e8izzN0cdVws2G8R0XiY=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGXN/tNLTOjhoLpwjnJENMajwP22EU1JR2RzL52wkJVqTc+oZOufkjF9OuDL3/4wwKQ==[/tex].'], 'type': 102}

设 [tex=4.643x1.214]6m6IpLK9nxKlloS9uQjB0nuL8Bfo83HknXeeHZE8fTo=[/tex] 为独立随机变量序列，且均服从参数为 [tex=0.643x1.0]+D9NhKovEP8INGz+KZnr1A==[/tex] 的指数分布，则(     ). 未知类型：{'options': ['[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmIUTBsiC6ukwZloTft28OVE9jW3ut9HI1N9tEOcvkrqVQ9FpF6LmXiNWlCfuJcWQM2wtbxNrFpUsjrl4evwxvNw=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGaIoHn3S0NVRV3Nu374V+dfJfPNpHnR1XUUEhYJLen2ML1zd6RRQ89pjNnVpuxZkjg==[/tex];', '[tex=13.714x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW3XOO6IdwGqZJo/UFwaW43UJidGoMck4Tr+afQtGl1GmM0otl7/ftYiYbfAmS7OAFjY9VGLkGg7y41mhfVeOp2vppe0YBplmd20NRcHmC8OBZ4e8izzN0cdVws2G8R0XiY=[/tex];', '[tex=14.286x5.214]8vJYfWnQRBqJWdmg/yoyrFXY9mkM5FxBz35AlgFEaW2pltwBBZlvkLgFzrrNrjClOiUpmp84TWntMIxPtMVgGXN/tNLTOjhoLpwjnJENMajwP22EU1JR2RzL52wkJVqTc+oZOufkjF9OuDL3/4wwKQ==[/tex].'], 'type': 102}

设随机变量 [tex=8.357x1.214]6m6IpLK9nxKlloS9uQjB0h9Y7ivXQgT+ccqHryZ2bZpJ8eBevWjvIRC9Kaz5rJjT[/tex] 相互独立且均服从参数为 [tex=0.643x1.0]+D9NhKovEP8INGz+KZnr1A==[/tex] 的指数分布,则下列结论正确的是 未知类型：{'options': ['[tex=14.286x5.214]OqU0SQaVHd2x+OGLCy0gvdWlo2ScfiOYU04NJqKzrqg8K/463qxHonAcSNjFfWosWvcNxKQIHYwazZl3SFQ2Q1TknwrF3lxQN9JCsr8jkT2EJnLJnj+xqs1n4scgF0v1IO7RIuLalyZVVVY8tO81TAL94VDKBmV+gjJk/knXdQg=[/tex]', '[tex=13.5x5.214]OqU0SQaVHd2x+OGLCy0gvdWlo2ScfiOYU04NJqKzrqgrAL0FVF/+40/lUyZr8ggq9JpNsnGyrQZ1fNMq504Q92Y3MF4s0DYupBiX19RhaHEN30o9Kqnqo/fuzKb9HcJ5K8MhQpi0usZLtn901WrPvA==[/tex]', '[tex=14.286x5.214]OqU0SQaVHd2x+OGLCy0gvdWlo2ScfiOYU04NJqKzrqg8K/463qxHonAcSNjFfWosWvcNxKQIHYwazZl3SFQ2QzbO8pNVbFLVgczVtIYf9WS3HxElZVbZZ0/k5pTGIGVyUKhUwTTnM+zSgrPFjNhbdX2fk0WweIyHREeEoKon+6h1jyjS2w54EBAC2RBzh+V8[/tex]', '[tex=13.5x5.214]OqU0SQaVHd2x+OGLCy0gvdWlo2ScfiOYU04NJqKzrqgrAL0FVF/+40/lUyZr8ggq9JpNsnGyrQZ1fNMq504Q9zFWI2oTps2/mjAKh9lIN9mqNEB7IivmBgoPLHePsGG/9tEe2Pdm9h67yp0qbXZRCbRPTPhLdKm9hDC871nOk+4=[/tex]\xa0其中\xa0[tex=10.071x2.714]p6v1l/6qxgLQNDat6qTXIjK3Bpe7d2OPsFRu4DprvOoKIq9O5veAgKvKE3BXW6AqghmFrUfjyPmQReFjzcUXloSgtBpM8cNgbgyc3SPcHF4=[/tex]'], '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)