diff --git a/create.py b/create.py
index ecf232f..bacccf3 100644
--- a/create.py
+++ b/create.py
@@ -1,12 +1,104 @@
 import random
+import re
+
 
 def create_number():
-    get_number = random.randint(0,100)
-    print(get_number)
+    get_number = random.randint(0,20)
+    # print(get_number)
     return get_number
 
 def create_sign():
-    sign = ['+','-','*','/']
+    sign = ['+','-','*','÷']
     get_sign = random.choice(sign)
-    print(get_sign)
-    return get_sign
\ No newline at end of file
+    # print(get_sign)
+    return get_sign
+
+def create_formula():
+    total = [3,5,7]
+    flag = random.choice(total)
+    # 生成算式  result数组
+    result = []
+    for i in range(flag):
+        # print(i)
+        if i % 2 == 0:
+            number = create_number()
+            result.append(number)
+        else:
+            sign = create_sign()
+            if (i+1) != flag:
+                result.append(sign)
+    # print(result)
+    # print("加入括号")
+    length = len(result)
+    brackets = [0, 1]
+    bracket = random.choice(brackets)
+    if length > 3:
+        # 随机加入括号
+        if bracket == 1:
+            for i in range(length):
+                if result[i] == '+' or result[i] == '-':
+                    result.insert(i-1,'(')
+                    result.insert(i+3,')')
+                    break
+
+    # print(result)
+    formula = str(str(result).replace("'","").replace(',','')).replace('[','').replace(']','')
+    # 计算
+    while len(result) != 1:
+        if '(' in result:
+            number_sign = result.index('(')+2
+            if result[number_sign] == '+':
+                number_num = result[number_sign - 1] + result[number_sign + 1]
+                result[number_sign -2] = number_num
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+
+            elif result[number_sign] == '-':
+                number_num = result[number_sign - 1] - result[number_sign + 1]
+                result[number_sign - 2] = number_num
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+                result.remove(result[number_sign - 1])
+
+        else:
+            if '*' in result:
+                number_sign = result.index('*')
+                number_num = float(result[number_sign - 1]) * float(result[number_sign + 1])
+                result[number_sign - 1] = number_num
+                result.remove(result[number_sign])
+                result.remove(result[number_sign])
+                # print(result)
+            elif '÷' in result:
+                number_sign = result.index('÷')
+                if result[number_sign + 1] == 0 or result[number_sign + 1] == '0':
+                    create_formula()
+                else:
+                    number_num = float(result[number_sign - 1]) / float(result[number_sign + 1])
+                    result[number_sign - 1] = number_num
+                    result.remove(result[number_sign])
+                    result.remove(result[number_sign])
+                # print(result)
+            elif '+' in result:
+                number_sign = result.index('+')
+                number_num = float(result[number_sign - 1]) + float(result[number_sign + 1])
+                result[number_sign - 1] = number_num
+                result.remove(result[number_sign])
+                result.remove(result[number_sign])
+                # print(result)
+            elif '-' in result:
+                number_sign = result.index('-')
+                number_num = float(result[number_sign - 1]) - float(result[number_sign + 1])
+                result[number_sign - 1] = number_num
+                result.remove(result[number_sign])
+                result.remove(result[number_sign])
+                # print(result)
+
+    result = str(result).replace('[','').replace(']','')[0:5]
+    print(result)
+    # print(formula)
+    return result,formula
+
+create_formula()
\ No newline at end of file