级数1/(1*3)+ 1/(3*5)+ 1/(5*7)+…收敛。
举一反三
- 级数1/(2*5)+1/(3*6)+1/(4*7)+…收敛
- 级数1 1/3 1/5 …收敛。
- 【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]
- 编写程序，输出下列的数字图形。 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1
- 5-1，对于下列代码，输入是1 3 5 7 9，那么 a 的值是什么？a = input().split() A: 1 B: 1 3 5 7 9 C: [1, 3, 5, 7, 9] D: ['1', '3', '5', '7', '9']