• 2022-07-22
    设 [tex=19.071x1.357]9iT23czbHhQCES+iSNK3EWjNyDqC+/sEar1vc88p9dr2wcSf7sMmOepiRO4q42/qgGhedcwB9YuHA56cMEAIyw==[/tex], 求[tex=0.5x0.786]gdMkE6SnyZedYLxpUxdkaQ==[/tex].
  • 因为 [tex=11.929x1.571]H6blVV8zULeHW1PSIchcRUoI9nIK9or2F4S8gIqizA6Wdxbz30ZQrIbUupXtrWWO[/tex],[tex=11.929x1.571]0IHXbA4q+4GWlAWy1scwnIGM07piBTSrBaAjbNhySGYr2B42i+ScN5elqQs5wti2[/tex].故由 [tex=5.857x1.357]9iT23czbHhQCES+iSNK3EVWPSMb/RoOGI4wSNwWRpkI=[/tex], 解得 [tex=1.786x1.0]DiJR/9DW631uuahYoMJyLg==[/tex].

    内容

    • 0

      找一种9 个[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex], 9 个[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex], 9 个[tex=0.5x0.786]EL0hSqs6jZBGdsmH7TMShQ==[/tex]的圆形排列,使由字母[tex=3.286x1.357]mnRYmWVlq1QQqwaBuICnZA==[/tex]组成的长度为3 的27个字的每个字仅出现一次。

    • 1

       已知离散时间单位阶跃信号  [tex=2.0x1.357]iZD6NkhBJKglclpk41Y0Tg==[/tex]的  [tex=0.5x0.786]C4QYj735kvdXFh+j8eTFZg==[/tex] 变换为 [tex=6.286x2.429]6bHRnXEcE3YuYgsZEcLaS9iRCWd9qeKmCIv7GxEBSgA=[/tex]利用  [tex=0.5x0.786]gdMkE6SnyZedYLxpUxdkaQ==[/tex]变换的性质求下列信号的[tex=0.5x0.786]gdMkE6SnyZedYLxpUxdkaQ==[/tex] 变换 [tex=3.0x1.5]lcNYeOjHojd31JjlC3RNbQ==[/tex]

    • 2

       已知离散时间单位阶跃信号  [tex=2.0x1.357]iZD6NkhBJKglclpk41Y0Tg==[/tex]的  [tex=0.5x0.786]C4QYj735kvdXFh+j8eTFZg==[/tex] 变换为 [tex=6.286x2.429]6bHRnXEcE3YuYgsZEcLaS9iRCWd9qeKmCIv7GxEBSgA=[/tex]利用  [tex=0.5x0.786]gdMkE6SnyZedYLxpUxdkaQ==[/tex]变换的性质求下列信号的[tex=0.5x0.786]gdMkE6SnyZedYLxpUxdkaQ==[/tex] 变换 [tex=2.571x3.286]1mLHjxcun+rgXN/f39rje0IyX6K9VMlbGLe63DfbQjA=[/tex]

    • 3

      以4,9,1为为插值节点,求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)

    • 4

      9判别下列函数是否是周期函数,若是周期函数,求其周期 :(1) [tex=8.357x1.357]jijpvC8Aw74QOOOJh5Va05j3PtA64Pms1Q5qDGlqeN4=[/tex](2) [tex=5.643x1.357]TG5DUF3HrCbhIJWDEcp5Pj9u3e2PUgpbN4NJQ6DZXLw=[/tex](3) [tex=5.714x1.357]SBxtvKszj8+jJcycMEKn5vqfhi5GLWqH4Gac9QRbIHc=[/tex](4) [tex=6.929x1.357]NZ5EVFRfE4pFsgkbEOhFkNg5/qZx8geAT5eL+yzbq1Q=[/tex]