Update app.py

app.py

@@ -42,14 +42,22 @@ elif selected_function == "展開":
         result = expand(expression)
         st.success(f"展開結果: {result.subs(user_defined_symbols)}")
 
+# 方程式(Sympy)
 # 方程式(Sympy)
 elif selected_function == "方程式":
     equation = st.text_input("解きたい方程式を入力してください:")
     if equation:
         x = symbols('x', real=True)
-        solution = solve(Eq(eval(equation), 0), x)
+        solution = solve(Eq(parse_expr(equation), 0), x)
+
+        # 小数の場合、分数に変換
+        for i in range(len(solution)):
+            if solution[i].is_Float:
+                solution[i] = N(solution[i], rational=True)
+
         st.success(f"方程式の解: {solution}")
 
+
 # 連立方程式(Sympy)
 elif selected_function == "連立方程式":
     eq1 = st.text_input("1つ目の方程式を入力してください:")