diff --git a/【实践课外】0.熟悉编程环境/7-1 重要的话说三遍.cpp b/【实践课外】0.熟悉编程环境/7-1 重要的话说三遍.cpp
new file mode 100644
index 0000000..667f732
--- /dev/null
+++ b/【实践课外】0.熟悉编程环境/7-1 重要的话说三遍.cpp	
@@ -0,0 +1,16 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cout << "I'm gonna WIN!" << endl;
+    cout << "I'm gonna WIN!" << endl;
+    cout << "I'm gonna WIN!" << endl;
+
+    return 0;
+}
diff --git a/【实践课外】0.熟悉编程环境/7-2 计算平均分.cpp b/【实践课外】0.熟悉编程环境/7-2 计算平均分.cpp
new file mode 100644
index 0000000..afb0068
--- /dev/null
+++ b/【实践课外】0.熟悉编程环境/7-2 计算平均分.cpp	
@@ -0,0 +1,14 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cout << "math = 87, eng = 72, comp = 93, average = " << (87 + 72 + 93) / 3 << endl;
+
+    return 0;
+}
diff --git a/【实践课外】0.熟悉编程环境/7-3 计算长方形的周长和面积.cpp b/【实践课外】0.熟悉编程环境/7-3 计算长方形的周长和面积.cpp
new file mode 100644
index 0000000..1103c82
--- /dev/null
+++ b/【实践课外】0.熟悉编程环境/7-3 计算长方形的周长和面积.cpp	
@@ -0,0 +1,19 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int a, b;
+
+    cin >> a >> b;
+
+    cout << "C = " << (a + b) * 2 << endl;
+    cout << "S = " << a * b << endl;
+
+    return 0;
+}
diff --git a/【实践课外】0.熟悉编程环境/7-4 简单最值.cpp b/【实践课外】0.熟悉编程环境/7-4 简单最值.cpp
new file mode 100644
index 0000000..45903e4
--- /dev/null
+++ b/【实践课外】0.熟悉编程环境/7-4 简单最值.cpp	
@@ -0,0 +1,19 @@
+#include <algorithm>
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+  std::ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  int a, b, c;
+
+  cin >> a >> b >> c;
+
+  cout << std::max({a, b, c}) << endl;
+
+  return 0;
+}