• 2022-06-06 问题

    Given generating function $G(x)=\frac{3+78x}{1-3x-54x^2}$, find the corresponding sequence $\{a_n\}$ A: $\{a_n\}=7*(-9)^n+4*6^n$ B: $\{a_n\}=7*9^n-4*6^n$ C: $\{a_n\}=7*9^n-4*(-6)^n$ D: $\{a_n\}=7*(-9)^n-4*6^n$ E: $\{a_n\}=7*(-9)^n+4*(-6)^n$ F: $\{a_n\}=7*(-9)^n-4*(-6)^n$

    Given generating function $G(x)=\frac{3+78x}{1-3x-54x^2}$, find the corresponding sequence $\{a_n\}$ A: $\{a_n\}=7*(-9)^n+4*6^n$ B: $\{a_n\}=7*9^n-4*6^n$ C: $\{a_n\}=7*9^n-4*(-6)^n$ D: $\{a_n\}=7*(-9)^n-4*6^n$ E: $\{a_n\}=7*(-9)^n+4*(-6)^n$ F: $\{a_n\}=7*(-9)^n-4*(-6)^n$

  • 2022-06-06 问题

    将\(f(x)=e^x\)展开成\((x-3)\)的幂级数为( )。 A: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) B: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) C: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\) D: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\)

    将\(f(x)=e^x\)展开成\((x-3)\)的幂级数为( )。 A: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) B: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - 1, 1)\) C: \(\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\) D: \({e^3}\sum\limits_{n = 0}^\infty { { { { {(x - 3)}^n}} \over {n!}}} \matrix{ {} & {} \cr } ( - \infty , + \infty )\)

  • 2022-05-31 问题

    下列数组声明语句中,不正确的是_________。 A: Dim a(9) As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} B: Dim a() = {1, 2, 3, 4, 5, 6, 10} C: Dim a( ,) As Single = {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}} D: Dim a() As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} E: Dim n As Integer=10Dim a(n) As Single

    下列数组声明语句中,不正确的是_________。 A: Dim a(9) As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} B: Dim a() = {1, 2, 3, 4, 5, 6, 10} C: Dim a( ,) As Single = {{1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}} D: Dim a() As Single = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} E: Dim n As Integer=10Dim a(n) As Single

  • 2022-06-16 问题

    以下程序输出结果为( )int n = 10;while(n>7){ n--; printf("%d ",n);} A: 10 9 8 B: 9 8 7 C: 10 9 8 7 D: 9 8 7 6

    以下程序输出结果为( )int n = 10;while(n>7){ n--; printf("%d ",n);} A: 10 9 8 B: 9 8 7 C: 10 9 8 7 D: 9 8 7 6

  • 2022-05-29 问题

    设\( \alpha {\rm{ = }}\left( {\matrix{ 1 \cr 0 \cr 1 \cr } } \right)\;A = \alpha {\alpha ^{T,}} \) ,则\( \left| {I - {A^n}} \right| = \) ( ) A: \( 1 + {2^n} \) B: \( 1 - {2^n} \) C: \( 1 + {3^n} \) D: \( 1 - {3^n} \)

    设\( \alpha {\rm{ = }}\left( {\matrix{ 1 \cr 0 \cr 1 \cr } } \right)\;A = \alpha {\alpha ^{T,}} \) ,则\( \left| {I - {A^n}} \right| = \) ( ) A: \( 1 + {2^n} \) B: \( 1 - {2^n} \) C: \( 1 + {3^n} \) D: \( 1 - {3^n} \)

  • 2022-05-29 问题

    对应ASCII码表,下列有关ASCII码值大小关系描述正确的是 A: “CR”<“d”<“G” B: “a”<“A”<“9” C: “9”<“A”<“CR” D: “9”<“R”<“n”

    对应ASCII码表,下列有关ASCII码值大小关系描述正确的是 A: “CR”<“d”<“G” B: “a”<“A”<“9” C: “9”<“A”<“CR” D: “9”<“R”<“n”

  • 2022-06-17 问题

    ‎对应ASCII码表,下列有关ASCII码值大小关系描述正确的是( )。‎ A: "CR"<"d"<"G" B: "a"<"A"<"9" C: "A"<"9"<"CR" D: "9"<"R"<"n"

    ‎对应ASCII码表,下列有关ASCII码值大小关系描述正确的是( )。‎ A: "CR"<"d"<"G" B: "a"<"A"<"9" C: "A"<"9"<"CR" D: "9"<"R"<"n"

  • 2022-05-28 问题

    有以下程序段: int n=10; while(n>7) { n--; printf("%d\n",n); } 程序段的输出结果是 A: 10 9 8 B: 9 8 7 C: 10<br> 9 8 7 D: 9 8 7 6

    有以下程序段: int n=10; while(n>7) { n--; printf("%d\n",n); } 程序段的输出结果是 A: 10 9 8 B: 9 8 7 C: 10<br> 9 8 7 D: 9 8 7 6

  • 2022-07-02 问题

    核外主量子数n=3的原子轨道共有()个 A: 3 B: 5 C: 7 D: 9

    核外主量子数n=3的原子轨道共有()个 A: 3 B: 5 C: 7 D: 9

  • 2022-06-01 问题

    对应ASCIl码表,下列有关ASCIl码值大小关系的描述中正确的是()。 A: “CR”<“d”<“G” B: “a”<“A”<“9” C: “9”<“A”<“CR” D: “9”<“R”<“n”

    对应ASCIl码表,下列有关ASCIl码值大小关系的描述中正确的是()。 A: “CR”<“d”<“G” B: “a”<“A”<“9” C: “9”<“A”<“CR” D: “9”<“R”<“n”

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