diff --git a/fa/eBook/05.0.md b/fa/eBook/05.0.md
deleted file mode 100644
index ba0e6af1..00000000
--- a/fa/eBook/05.0.md
+++ /dev/null
@@ -1,13 +0,0 @@
-# 5 Database
-
-For web developers, the database is at the core of web development. You can save almost anything into a database and query or update data inside it, like user information, products or news articles.
-
-Go doesn't provide any database drivers, but it does have a driver interface defined in the `database/sql` package. People can develop database drivers based on that interface. In section 5.1, we are going to talk about database driver interface design in Go; in sections 5.2 to 5.4, I will introduce some SQL database drivers to you; in section 5.5, i'll present the ORM　that i've developed which is based on the `database/sql` interface standard. It's compatible with most drivers that have implemented the `database/sql` interface, and it makes it easy to access databases idiomatically in Go.
-
-NoSQL has been a hot topic in recent years. More websites are deciding to use NoSQL databases as their main database instead of just for the purpose of caching. I will introduce you to two NoSQL databases, which are MongoDB and Redis, in section 5.6.
-
-## Links
-
-- [Directory](preface.md)
-- Previous Chapter: [Chapter 4 Summary](04.6.md)
-- Next section: [database/sql interface](05.1.md)
diff --git a/fa/eBook/05.0.md.orig b/fa/eBook/05.0.md.orig
deleted file mode 100644
index ba0e6af1..00000000
--- a/fa/eBook/05.0.md.orig
+++ /dev/null
@@ -1,13 +0,0 @@
-# 5 Database
-
-For web developers, the database is at the core of web development. You can save almost anything into a database and query or update data inside it, like user information, products or news articles.
-
-Go doesn't provide any database drivers, but it does have a driver interface defined in the `database/sql` package. People can develop database drivers based on that interface. In section 5.1, we are going to talk about database driver interface design in Go; in sections 5.2 to 5.4, I will introduce some SQL database drivers to you; in section 5.5, i'll present the ORM　that i've developed which is based on the `database/sql` interface standard. It's compatible with most drivers that have implemented the `database/sql` interface, and it makes it easy to access databases idiomatically in Go.
-
-NoSQL has been a hot topic in recent years. More websites are deciding to use NoSQL databases as their main database instead of just for the purpose of caching. I will introduce you to two NoSQL databases, which are MongoDB and Redis, in section 5.6.
-
-## Links
-
-- [Directory](preface.md)
-- Previous Chapter: [Chapter 4 Summary](04.6.md)
-- Next section: [database/sql interface](05.1.md)
diff --git a/fa/src/1.2/main.go b/fa/src/1.2/main.go
deleted file mode 100644
index 132c60a7..00000000
--- a/fa/src/1.2/main.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// 章节 1.2
-// $GOPATH/src/mathapp/main.go
-
-package main
-
-import (
-	"fmt"
-	"mymath"
-)
-
-func main() {
-	fmt.Printf("Hello, world.  Sqrt(2) = %v\n", mymath.Sqrt(2))
-}
diff --git a/fa/src/1.2/sqrt.go b/fa/src/1.2/sqrt.go
deleted file mode 100644
index 1d596053..00000000
--- a/fa/src/1.2/sqrt.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// 章节 1.2
-// $GOPATH/src/mymath/sqrt.go
-package mymath
-
-func Sqrt(x float64) float64 {
-	z := 0.0
-	for i := 0; i < 1000; i++ {
-		z -= (z*z - x) / (2 * x)
-	}
-	return z
-}