diff --git a/【实践课外】8.数组2/7-25 数组-杨辉三角.c b/【实践课外】8.数组2/7-25 数组-杨辉三角.c
new file mode 100644
index 0000000..5b24a7f
--- /dev/null
+++ b/【实践课外】8.数组2/7-25 数组-杨辉三角.c	
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int n, f[25][25];
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        f[i][1] = f[i][i] = 1;
+    }
+
+    for (int i = 2; i <= n; i++) {
+        for (int j = 2; j < i; j++) {
+            f[i][j] = f[i - 1][j - 1] + f[i - 1][j];
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= i; j++) {
+            printf("%7d", f[i][j]);
+        }
+
+        printf("\n");
+    }
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-25 数组-杨辉三角.jpg b/【实践课外】8.数组2/7-25 数组-杨辉三角.jpg
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diff --git a/【实践课外】8.数组2/7-26 数组-对角线求和.c b/【实践课外】8.数组2/7-26 数组-对角线求和.c
new file mode 100644
index 0000000..aca9519
--- /dev/null
+++ b/【实践课外】8.数组2/7-26 数组-对角线求和.c	
@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+int n, mat[105][105], sum1 = 0, sum2 = 0;
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            scanf("%d", &mat[i][j]);
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            if (i == j) {
+                sum1 += mat[i][j];
+            }
+
+            if (i + j == n + 1) {
+                sum2 += mat[i][j];
+            }
+        }
+    }
+
+    printf("%d %d\n", sum1, sum2);
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-26 数组-对角线求和.jpg b/【实践课外】8.数组2/7-26 数组-对角线求和.jpg
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diff --git a/【实践课外】8.数组2/7-27 数组-矩阵最小值.c b/【实践课外】8.数组2/7-27 数组-矩阵最小值.c
new file mode 100644
index 0000000..05879f1
--- /dev/null
+++ b/【实践课外】8.数组2/7-27 数组-矩阵最小值.c	
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int m, n, mat[25][25], min, min_i, min_j;
+
+int main() {
+    scanf("%d%d", &m, &n);
+
+    for (int i = 1; i <= m; i++) {
+        for (int j = 1; j <= n; j++) {
+            scanf("%d", &mat[i][j]);
+        }
+    }
+
+    min = mat[1][1];
+    min_i = 1;
+    min_j = 1;
+
+    for (int i = 1; i <= m; i++) {
+        for (int j = 1; j <= n; j++) {
+            if (mat[i][j] < min) {
+                min = mat[i][j];
+                min_i = i;
+                min_j = j;
+            }
+        }
+    }
+
+    printf("%d %d %d\n", min, min_i, min_j);
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-27 数组-矩阵最小值.jpg b/【实践课外】8.数组2/7-27 数组-矩阵最小值.jpg
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index 0000000..6fbd3d6
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diff --git a/【实践课外】8.数组2/7-4 矩阵运算.c b/【实践课外】8.数组2/7-4 矩阵运算.c
new file mode 100644
index 0000000..2fa3f31
--- /dev/null
+++ b/【实践课外】8.数组2/7-4 矩阵运算.c	
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+int n, mat[15][15], sum = 0;
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            scanf("%d", &mat[i][j]);
+        }
+    }
+
+    for (int i = 1; i <= n - 1; i++) {
+        for (int j = 1; j <= n - 1; j++) {
+            if (i + j != n + 1) {  // 剔除副对角线
+                sum += mat[i][j];
+            }
+        }
+    }
+
+    printf("%d\n", sum);
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-4 矩阵运算.jpg b/【实践课外】8.数组2/7-4 矩阵运算.jpg
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index 0000000..0aa9ead
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diff --git a/【实践课外】8.数组2/7-6 方阵循环右移.c b/【实践课外】8.数组2/7-6 方阵循环右移.c
new file mode 100644
index 0000000..cabea92
--- /dev/null
+++ b/【实践课外】8.数组2/7-6 方阵循环右移.c	
@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+int m, n, mat[10][10];
+
+int main() {
+    scanf("%d%d", &m, &n);
+
+    m %= n;
+
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j < n; j++) {
+            scanf("%d", &mat[i][j]);
+        }
+    }
+
+    for (int i = 0; i < n; i++) {
+        for (int j = n - m; j < n; j++) {
+            printf("%d ", mat[i][j]);
+        }
+
+        for (int j = 0; j < n - m; j++) {
+            printf("%d ", mat[i][j]);
+        }
+
+        printf("\n");
+    }
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-6 方阵循环右移.jpg b/【实践课外】8.数组2/7-6 方阵循环右移.jpg
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diff --git a/【实践课外】8.数组2/7-7 螺旋方阵.c b/【实践课外】8.数组2/7-7 螺旋方阵.c
new file mode 100644
index 0000000..9072c67
--- /dev/null
+++ b/【实践课外】8.数组2/7-7 螺旋方阵.c	
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int n, mat[15][15];
+
+int main() {
+    scanf("%d", &n);
+
+    int x = 1, y = 1, dx = 0, dy = 1;
+
+    for (int i = 1; i <= n * n; i++) {
+        mat[x][y] = i;
+
+        if (x + dx > n || x + dx < 1 || y + dy > n || y + dy < 1 || mat[x + dx][y + dy]) {
+            int tmp = dx;
+            dx = dy;
+            dy = -tmp;
+        }
+
+        x += dx;
+        y += dy;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            printf("%3d", mat[i][j]);
+        }
+
+        printf("\n");
+    }
+
+    return 0;
+}
diff --git a/【实践课外】8.数组2/7-7 螺旋方阵.jpg b/【实践课外】8.数组2/7-7 螺旋方阵.jpg
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index 0000000..e71dccc
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