对于任意[tex=3.786x1.214]IwYEBXlv6G8nXHORq7dWRg==[/tex],证明[tex=16.857x1.357]3opgiHjiV3J2os2f/2GgYxtqL7AqjU61ti6O3L2RljV+dEIGdQGKa5l9glj/mx9fpHW9lbllQjRHKkTvfQt7AQ==[/tex]
对于任意[tex=3.786x1.214]IwYEBXlv6G8nXHORq7dWRg==[/tex],证明[tex=16.857x1.357]3opgiHjiV3J2os2f/2GgYxtqL7AqjU61ti6O3L2RljV+dEIGdQGKa5l9glj/mx9fpHW9lbllQjRHKkTvfQt7AQ==[/tex]
设总体密度函数为[tex=16.857x1.357]MLSPlxCvAecuDcsebuFbEi7HljB+qNHcbu16e3rA+wV0pn5x3OqZsKpN5vSVSbYG[/tex] 是来自该总体的样本,试求样本中位数的分布.
设总体密度函数为[tex=16.857x1.357]MLSPlxCvAecuDcsebuFbEi7HljB+qNHcbu16e3rA+wV0pn5x3OqZsKpN5vSVSbYG[/tex] 是来自该总体的样本,试求样本中位数的分布.
指出下列函数中哪些是周期函数并求出它们的周期.[tex=12.286x1.357]WuDtQe1ubto/TSJXLjC5xZplOB/+0Qd1cWI00+5cyAKY0R0htIqBvE30cVfhTAOB[/tex][tex=16.857x1.357]rcUbQ43VbCaRczao2jIfXT3GJg8VpicIMZ19ATgQMbTyPET4JqeMop5jcAiviQXq06U+AZWiIeY5KcDS3i54IQ==[/tex]
指出下列函数中哪些是周期函数并求出它们的周期.[tex=12.286x1.357]WuDtQe1ubto/TSJXLjC5xZplOB/+0Qd1cWI00+5cyAKY0R0htIqBvE30cVfhTAOB[/tex][tex=16.857x1.357]rcUbQ43VbCaRczao2jIfXT3GJg8VpicIMZ19ATgQMbTyPET4JqeMop5jcAiviQXq06U+AZWiIeY5KcDS3i54IQ==[/tex]
设函数 [tex=7.5x1.357]gBSiTnL2HWCl77QZI1XYQv/Y+fLOE4f+Dk36Bg2scok=[/tex]是某二阶线性非齐次微分方程[tex=10.071x1.429]rjzw0bBUODiY66l+Mq83xEVYuok5aTyNKBHk7Ohh0ke18AALqig/xjcjY0P5/VcW[/tex]的三个线性无关解.[tex=0.786x1.0]YClmpUr0Z+jLhTxYPrv7Dg==[/tex] 和[tex=0.786x1.0]HapOvs4pr79OPnuReVwJ/Q==[/tex] 为任意常数,则该微分方程的通解为 未知类型:{'options': ['[tex=11.0x1.357]R/d1bTBiESUr7AYmYv25Og894TavNAEFfl0bfovxE17BDNu/qB2hP5JGnUuZgzHo[/tex]', '[tex=16.857x1.357]R/d1bTBiESUr7AYmYv25OtiEBxeLnwS3uzudZKZZD13kyTv3ncue+R+qikoBQxby6MG1AwQPRHE6FW9ga5nnvpUxvHzk1wYua+cEt93YTH2R0isi8kt8hBpC2/GmgNR1[/tex]', '[tex=16.857x1.357]IIey2g2p21zkMq09CnQEai1cWNzVcpqBdvHHGO6vkizW8/ttw5lUmRDFj+j0UGMxfJ77Yus13L2rjKfF7Bi6M4CJJ7FNBWtQ3iuASGUuPAx5y+T0R3Vnt5JIK87pm6SK[/tex]', '[tex=14.143x1.357]B/gByBNO76AeHbsjFG265DoixJ1jzRfLo7Z/T03uMkBMKaAScxqD9OjB6aLBI0HuaNoulmG75pgXaV0KyWi9dg==[/tex]'], 'type': 102}
设函数 [tex=7.5x1.357]gBSiTnL2HWCl77QZI1XYQv/Y+fLOE4f+Dk36Bg2scok=[/tex]是某二阶线性非齐次微分方程[tex=10.071x1.429]rjzw0bBUODiY66l+Mq83xEVYuok5aTyNKBHk7Ohh0ke18AALqig/xjcjY0P5/VcW[/tex]的三个线性无关解.[tex=0.786x1.0]YClmpUr0Z+jLhTxYPrv7Dg==[/tex] 和[tex=0.786x1.0]HapOvs4pr79OPnuReVwJ/Q==[/tex] 为任意常数,则该微分方程的通解为 未知类型:{'options': ['[tex=11.0x1.357]R/d1bTBiESUr7AYmYv25Og894TavNAEFfl0bfovxE17BDNu/qB2hP5JGnUuZgzHo[/tex]', '[tex=16.857x1.357]R/d1bTBiESUr7AYmYv25OtiEBxeLnwS3uzudZKZZD13kyTv3ncue+R+qikoBQxby6MG1AwQPRHE6FW9ga5nnvpUxvHzk1wYua+cEt93YTH2R0isi8kt8hBpC2/GmgNR1[/tex]', '[tex=16.857x1.357]IIey2g2p21zkMq09CnQEai1cWNzVcpqBdvHHGO6vkizW8/ttw5lUmRDFj+j0UGMxfJ77Yus13L2rjKfF7Bi6M4CJJ7FNBWtQ3iuASGUuPAx5y+T0R3Vnt5JIK87pm6SK[/tex]', '[tex=14.143x1.357]B/gByBNO76AeHbsjFG265DoixJ1jzRfLo7Z/T03uMkBMKaAScxqD9OjB6aLBI0HuaNoulmG75pgXaV0KyWi9dg==[/tex]'], 'type': 102}
设模拟信号[tex=16.857x1.357]UPsDGVx2HEZTVj7qMM1Tkg/b8Y1yiSJFwLdCA3E0MrcBAJ6kqpc1sPGY1PMljpekJb8cPoL4AMRgeiwMDUsKjeMpMpq++qWLGQzTR2qaAx7bo/xqgmG+Ori3OT55BdMNvR9TVKQ525dQvoVWu12OAg==[/tex],式中[tex=12.714x1.214]vMkLr36AuZ+OVyifYm3/tZzwVHQx1oxYRkii2h2afMbtVcJbgCM5VTqI9cIV4L2M7qXFWyGh43uao1mQOjHXTGQjfHTOZbomgNzuf76zbDc=[/tex]是常数。为将该模拟信号[tex=2.071x1.286]gAwZ5Cd6U1Amb3XrqzLuXQ==[/tex]转换成时域离散信号[tex=1.857x1.286]2p+SJP2gO0z5hWPrWwpglA==[/tex],最小的采样频率[tex=2.286x1.214]Lz2PG1PP/AxGHY3zgB9jbw==[/tex]应取多少?
设模拟信号[tex=16.857x1.357]UPsDGVx2HEZTVj7qMM1Tkg/b8Y1yiSJFwLdCA3E0MrcBAJ6kqpc1sPGY1PMljpekJb8cPoL4AMRgeiwMDUsKjeMpMpq++qWLGQzTR2qaAx7bo/xqgmG+Ori3OT55BdMNvR9TVKQ525dQvoVWu12OAg==[/tex],式中[tex=12.714x1.214]vMkLr36AuZ+OVyifYm3/tZzwVHQx1oxYRkii2h2afMbtVcJbgCM5VTqI9cIV4L2M7qXFWyGh43uao1mQOjHXTGQjfHTOZbomgNzuf76zbDc=[/tex]是常数。为将该模拟信号[tex=2.071x1.286]gAwZ5Cd6U1Amb3XrqzLuXQ==[/tex]转换成时域离散信号[tex=1.857x1.286]2p+SJP2gO0z5hWPrWwpglA==[/tex],最小的采样频率[tex=2.286x1.214]Lz2PG1PP/AxGHY3zgB9jbw==[/tex]应取多少?
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}
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)
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)
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)
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)