diff --git a/227-3.py b/227-3.py
index c56f62c..77bca4f 100644
--- a/227-3.py
+++ b/227-3.py
@@ -63,7 +63,7 @@ def prettyPrintMatrix(matrix):
 if __name__ == "__main__":
     # A = np.array(A, dtype=float)
     # b = np.array(b, dtype=float)
-      
+       #把矩阵A和b改成题干要求的#####################################
     A = [
         [0, 3, 4],
         [1, -1, 1],
diff --git a/227-4.py b/227-4.py
index 115fa58..ad66601 100644
--- a/227-4.py
+++ b/227-4.py
@@ -22,7 +22,7 @@ def SqrtSolve(A,b):
                 for k in range(j):
                     L[getIndexFromDownMatrix(i,j)] -= L[getIndexFromDownMatrix(i,k)]*L[getIndexFromDownMatrix(j,k)]
                 L[getIndexFromDownMatrix(i,j)] /= L[getIndexFromDownMatrix(j,j)]
-
+    print(L)
     for i in range(n):
         for k in range(i):
             b[i] -= L[getIndexFromDownMatrix(i,k)]*b[k]
@@ -34,7 +34,7 @@ def SqrtSolve(A,b):
         b[i] /= L[getIndexFromDownMatrix(i,i)]
     return b
 
-
+#把A,b换成题干的数值###########################################
 if __name__ == "__main__":
     # 储存下三角矩阵 a11, a21, a22, a31, a32, a33 ...
     A = [4,2,2,-2,-3,14]
diff --git a/227-7.py b/227-7.py
index 05e1cd2..51f3082 100644
--- a/227-7.py
+++ b/227-7.py
@@ -8,19 +8,21 @@ def ZGsolve(A,b):
             beta[i] = A[i][2] / A[i][1]
         else:
             beta[i] = A[i][2] / (A[i][1] - A[i][0]*beta[i-1])
-
+    print("beta:")
+    print(beta[:-1])
     for i in range(n):
         if i == 0:
             b[i] = b[i] / A[i][1]
         else:
             b[i] = (b[i] - A[i][0]*b[i-1]) / (A[i][1] - A[i][0]*beta[i-1])
-
+    print("y:")
+    print(b)
     for i in range(n-2,-1,-1):
         b[i] = b[i] - beta[i]*b[i+1]
 
     return b
 
-
+#把A,b换成题干的数值###########################################
 if __name__ == "__main__":
     # 储存追赶法A矩阵
     A = [