diff --git a/demo7.5.txt b/demo7.5.txt
new file mode 100644
index 0000000000000000000000000000000000000000..30a4cc366ca88538456c2310ce1349f8d67bff79
--- /dev/null
+++ b/demo7.5.txt
@@ -0,0 +1,24 @@
+import numpy as np
+#a=np.array([[1,2,3],[1,2,3],[1,2,3]])
+#b=np.array([1,2,3])
+#print(a.dot(b))#点乘
+#print(a.T)#转置
+#print(np.linalg.pinv(a))#逆
+from datas import datas
+X=[]
+Y=[]
+cityMark={"吕梁":1,"太原":2}
+for item in datas:
+    single=[]
+    single.append(cityMark[item["city"]])
+    single.append(item["area"])
+    single.append(item["rooms"])
+    single.append(item["school"])
+    single.append(item["style"])
+    X.append(single)
+    Y.append(item["price"])
+X=np.array(X)
+Y=np.array(Y)
+
+theta=np.linalg.pinv(X.T.dot(X)).dot(X.T).dot(Y)
+print(theta.dot(np.array([2,100,2,1,2])))
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