对以下各序列, 试求其 DTFT, 即求[tex=3.214x1.571]V5CZPDBh0gnsQzqmO1OBVcj/m9aoHrMEaeoW5MsLQnWg0FR6zg/nQYFBi5BX3E63[/tex], 画出 [tex=3.857x1.571]CTjHrgs62ORrq5JoCpZLTdkY5ANEP2IstltjLfH5mxMwqmtXQnrTUL4Wmi7i0HC3rnLDFkbUa1/VbBJ6A9MASw==[/tex]及[tex=5.429x1.571]eGj96umWBFSx5UdXDBlEXOhGz3d+D4O01AHZ5UlIrRYOBUTQsmZ1eRoInAn2dumQUXPasfeFvHAzDIHkK9JfxwHaJmHsHud7vqq/XmGz1n8=[/tex]。[tex=13.857x1.357]evSY7cp3074Cm7yePWbT+pUuvWikq5mk+JP1Be1dTlYZRPvuZjLUxnd9f4ioOpE9[/tex]
举一反三
- 对以下各序列, 试求其 DTFT, 即求[tex=3.214x1.571]V5CZPDBh0gnsQzqmO1OBVcj/m9aoHrMEaeoW5MsLQnWg0FR6zg/nQYFBi5BX3E63[/tex], 画出 [tex=3.857x1.571]CTjHrgs62ORrq5JoCpZLTdkY5ANEP2IstltjLfH5mxMwqmtXQnrTUL4Wmi7i0HC3rnLDFkbUa1/VbBJ6A9MASw==[/tex]及[tex=5.429x1.571]eGj96umWBFSx5UdXDBlEXOhGz3d+D4O01AHZ5UlIrRYOBUTQsmZ1eRoInAn2dumQUXPasfeFvHAzDIHkK9JfxwHaJmHsHud7vqq/XmGz1n8=[/tex]。[tex=14.357x1.357]79HHsp/CIBPhox5P6fKqloVgM4N1eTt3LdiBfwAizc4=[/tex]
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为？ A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
- 【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=