diff --git a/homework/2/1.py b/homework/2/1.py
new file mode 100644
index 0000000..ba5c3e1
--- /dev/null
+++ b/homework/2/1.py
@@ -0,0 +1,6 @@
+print('''
+精勤求学
+敦笃励志
+果毅力行
+忠恕任事
+''')
\ No newline at end of file
diff --git a/homework/2/2.py b/homework/2/2.py
new file mode 100644
index 0000000..5d33509
--- /dev/null
+++ b/homework/2/2.py
@@ -0,0 +1,2 @@
+a = float(input())
+print(a*666.666666667)
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diff --git a/homework/2/3.py b/homework/2/3.py
new file mode 100644
index 0000000..1d4a128
--- /dev/null
+++ b/homework/2/3.py
@@ -0,0 +1,8 @@
+x1,y1 = map(float,input().split())
+x2,y2 = map(float,input().split())
+a = complex(round(x1+x2,1),round(y1+y2,1))
+b = complex(round(x1-x2,1),round(y1-y2,1))
+print(a)
+print(b)
+
+# 这个代码暂时有 bug，整数的时候不会补 0，但是暂时够用了
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diff --git a/homework/2/4.py b/homework/2/4.py
new file mode 100644
index 0000000..c6095c3
--- /dev/null
+++ b/homework/2/4.py
@@ -0,0 +1,7 @@
+a, b, c = map(float, input().split())
+if (a+b <= c or b+c <= a or c+a < b):
+    print(-1)
+else:
+    p = (a+b+c)/2
+    ans = (p*(p-a)*(p-b)*(p-c))**0.5
+    print("%.2f" % ans)
diff --git a/homework/2/5.py b/homework/2/5.py
new file mode 100644
index 0000000..591b3c6
--- /dev/null
+++ b/homework/2/5.py
@@ -0,0 +1,5 @@
+a, b, c = map(int, input().split())
+m = max(a, b, c)
+n = min(a, b, c)
+p = a+b+c-n-m
+print(n, p, m)
diff --git a/homework/2/6.py b/homework/2/6.py
new file mode 100644
index 0000000..474af36
--- /dev/null
+++ b/homework/2/6.py
@@ -0,0 +1,22 @@
+a = int(input())
+ans = 0
+while (a):
+    if (a >= 100):
+        a -= 100
+        ans += 1
+    elif (a >= 50):
+        a -= 50
+        ans += 1
+    elif (a >= 20):
+        a -= 20
+        ans += 1
+    elif (a >= 10):
+        a -= 10
+        ans += 1
+    elif (a >= 5):
+        a -= 5
+        ans += 1
+    else:
+        a -= 1
+        ans += 1
+print(ans)
diff --git a/homework/2/7.py b/homework/2/7.py
new file mode 100644
index 0000000..e1da9a7
--- /dev/null
+++ b/homework/2/7.py
@@ -0,0 +1,10 @@
+m,kg = map(float,input().split())
+b = kg/m**2
+if(b<18.5):
+    print("A")
+elif(b<24):
+    print("B")
+elif(b<28):
+    print("C")
+else :
+    print("D")
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