• 2022-06-27 问题

    [tex=18.286x1.286]7OzYu1fkCTQhBaQ8JK5MihLO8K7JOq0YgI4KuD2N0qOuDdkVckXvxyX4wZA+7kXVRyFGhGuv74eICwzfXriK7g==[/tex]

    [tex=18.286x1.286]7OzYu1fkCTQhBaQ8JK5MihLO8K7JOq0YgI4KuD2N0qOuDdkVckXvxyX4wZA+7kXVRyFGhGuv74eICwzfXriK7g==[/tex]

  • 2022-07-24 问题

    [tex=18.286x1.286]zNinFTzSKA6stlhanIg3dwRbmNyh43BmBZIKt2EHzPSRzRwrSXyp6z8e2W2yFvqDgjOCKhBK7W6hAy6b3e/j4m4LTC9B/+/6IQlqLkk/D0w=[/tex][tex=22.714x1.286]nvXaYgezSwglNRJ3xK43aAYUBr0ZQwuhOQ7k2o7ODPyUHsqjQYUBw1PlH8uO9lmPWl55geqskBBWNlHn04+4KzGBHdaK2PXSNvEUGiYfP/o=[/tex]

    [tex=18.286x1.286]zNinFTzSKA6stlhanIg3dwRbmNyh43BmBZIKt2EHzPSRzRwrSXyp6z8e2W2yFvqDgjOCKhBK7W6hAy6b3e/j4m4LTC9B/+/6IQlqLkk/D0w=[/tex][tex=22.714x1.286]nvXaYgezSwglNRJ3xK43aAYUBr0ZQwuhOQ7k2o7ODPyUHsqjQYUBw1PlH8uO9lmPWl55geqskBBWNlHn04+4KzGBHdaK2PXSNvEUGiYfP/o=[/tex]

  • 2022-05-29 问题

    下列选项为某变速器一、二、三、四挡的传动比,则三挡的传动比为()。 A: 0.969 B: 1.286 C: 1.944 D: 3.455

    下列选项为某变速器一、二、三、四挡的传动比,则三挡的传动比为()。 A: 0.969 B: 1.286 C: 1.944 D: 3.455

  • 2022-10-31 问题

    [tex=40.643x1.286]Q+0Yl05DaDUyV4s0iZXJ22a80GdXRXT5ZNks4lEkZCPTK/Yk8hdAcP3MdncIINSYQ2w+VHWpN1YIWvkQN4IR8wd2xdx3ZPPvFVhjHlViXYxnxBCprjVSjMa2FNF4WHGQb/EsnHEIFKTlWSzmqGWY2uftbOYBVVLx9a10mChkD2Rj1i0KxV3Ah6Z38tuI72Uw[/tex][tex=38.429x1.286]tat9kBE40xGxZANB99DbCjoJpfkSwE+JoXUZXejV34rQk6/mAPTxSI/kva+1fUz66uW2jac1kBlC/EPvZQ00NmiiQpyKaY17rE+IgToWRXU6nJ56nKKNHF7dhnzmxdV4fvRCdoncAx5uSK7TTyHmH9V3uzQCPQz91obqB2xSS6Q=[/tex][tex=18.286x1.286]xGskTqNkQDzaN0Jkz+gFSlj4GclwzzerPTKIQ2WcuTomulD5EEkvA8MOatnBGlEE2TGrYT+KrRjc+jYgQ6G1GCe72I4jLM3pFetGv0NCCSY=[/tex][img=389x356]179f8e83dbf76bd.png[/img]

    [tex=40.643x1.286]Q+0Yl05DaDUyV4s0iZXJ22a80GdXRXT5ZNks4lEkZCPTK/Yk8hdAcP3MdncIINSYQ2w+VHWpN1YIWvkQN4IR8wd2xdx3ZPPvFVhjHlViXYxnxBCprjVSjMa2FNF4WHGQb/EsnHEIFKTlWSzmqGWY2uftbOYBVVLx9a10mChkD2Rj1i0KxV3Ah6Z38tuI72Uw[/tex][tex=38.429x1.286]tat9kBE40xGxZANB99DbCjoJpfkSwE+JoXUZXejV34rQk6/mAPTxSI/kva+1fUz66uW2jac1kBlC/EPvZQ00NmiiQpyKaY17rE+IgToWRXU6nJ56nKKNHF7dhnzmxdV4fvRCdoncAx5uSK7TTyHmH9V3uzQCPQz91obqB2xSS6Q=[/tex][tex=18.286x1.286]xGskTqNkQDzaN0Jkz+gFSlj4GclwzzerPTKIQ2WcuTomulD5EEkvA8MOatnBGlEE2TGrYT+KrRjc+jYgQ6G1GCe72I4jLM3pFetGv0NCCSY=[/tex][img=389x356]179f8e83dbf76bd.png[/img]

  • 2022-06-12 问题

    假定在连续[tex=1.0x1.286]oqTX8Aml1lQZAP0gMGUYCw==[/tex]个周末所观察的股票价格(以美元计)为:[tex=15.571x1.286]qiPxfL6zZuIVuHcgqAoTEJIo3Qp7yqYtiL0vrGnJ34S7ANs953NEvKX6X2vdVfJk[/tex][tex=18.286x1.286]Sn9V8mVoGUcUMFsFr2BHs9uEZ4QFUaRgcACdW96mMVc1M9zgsIGlk0a36oAB6/gPlicGpYN1vDwycjm9RR2t0g==[/tex][tex=4.429x1.286]GfqMcJaRZgxKIEtQFkWbWcBd7cPgCfUEGWvGXwhcORM=[/tex]估计股票价格的波动率,你所估计结果的标准差为多少?

    假定在连续[tex=1.0x1.286]oqTX8Aml1lQZAP0gMGUYCw==[/tex]个周末所观察的股票价格(以美元计)为:[tex=15.571x1.286]qiPxfL6zZuIVuHcgqAoTEJIo3Qp7yqYtiL0vrGnJ34S7ANs953NEvKX6X2vdVfJk[/tex][tex=18.286x1.286]Sn9V8mVoGUcUMFsFr2BHs9uEZ4QFUaRgcACdW96mMVc1M9zgsIGlk0a36oAB6/gPlicGpYN1vDwycjm9RR2t0g==[/tex][tex=4.429x1.286]GfqMcJaRZgxKIEtQFkWbWcBd7cPgCfUEGWvGXwhcORM=[/tex]估计股票价格的波动率,你所估计结果的标准差为多少?

  • 2022-06-30 问题

    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}

    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}

  • 2021-04-14 问题

    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)

  • 2021-04-14 问题

    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)

  • 2022-06-29 问题

    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)

    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)

  • 2022-06-25 问题

    判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)

    判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)

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