diff --git a/1/4.ipynb b/1/4.ipynb
index 8484a6f..d77a982 100644
--- a/1/4.ipynb
+++ b/1/4.ipynb
@@ -2,27 +2,51 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "hellohellohello\n"
+     ]
+    }
+   ],
    "source": [
     "print(\"hello\" * 3)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "x = 2, y = 3.000000\n"
+     ]
+    }
+   ],
    "source": [
     "print(\"x = %d, y = %f\" % (2, 3.0))"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(2-3j)\n"
+     ]
+    }
+   ],
    "source": [
     "x = 3 + 2j\n",
     "y = -1j\n",
@@ -31,9 +55,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "abcdefg\n",
+      "bc\n",
+      "bcdefg\n",
+      "abc\n",
+      "abcdef\n",
+      "ef\n",
+      "efg\n",
+      "abcdefg\n",
+      "aceg\n",
+      "gfedcba\n"
+     ]
+    }
+   ],
    "source": [
     "strs = \"abcdefg\"\n",
     "print(strs[0:7:1])\n",
@@ -50,9 +91,17 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "较小值为：  5.4\n"
+     ]
+    }
+   ],
    "source": [
     "def minimal(x, y):\n",
     "    if x > y:\n",