diff --git a/260421-2509165039.py b/260421-2509165039.py
new file mode 100644
index 0000000..2f42e69
--- /dev/null
+++ b/260421-2509165039.py
@@ -0,0 +1,43 @@
+# 题目1 在Python中，用两种方式表示"Hello"：
+# 1.用 ord() 函数打印每个字符的ASCII码
+text = "Hello"
+for char in text:
+    print(f"'{char}'的ASCII码是:{ord(char)}")
+
+# 2.用 chr() 函数验证：字符65对应的是大写字母A
+char_65 = chr(65)
+print(f"ASCII码65对应的字符是:{cahr_65}")
+print(f"验证结果:{char_65 == 'A'}")
+
+
+
+# 题目3
+# 1.计算 A + B 的结果:
+A = [3,4]
+B = [1,2]
+A_plus_B = [a + b for a,b in zip(A,B)]
+print(f"A + B = {A_plus_B}")
+
+# 2.计算 2 × A 的结果:
+scalar = 2
+two_A = [scalar * a for a in A]
+print(f"2 * A = {two_A}")
+
+# 3.计算 A 的长度（模）:
+import math
+A_magnitutude = math.sqrt(sum(a**2 for a in A))
+print(f"A的长度(模)是:{A_magnitutude}")
+
+
+# 题目4
+# 1.计算它们的点积 A · B:
+A = [1,2,3]
+B = [4,5,6]
+dot_product = sum(a * b for a,b in zip(A,B))
+print(f"A * B ={dot_product}")
+
+# 2.计算它们的余弦相似度:
+import math
+A = [1,2,3]
+B = [4,5,6]
+dot_product = sum(a * b for a,b in )
\ No newline at end of file