diff --git a/main.go b/main.go
index f31fd86..1efbca3 100644
--- a/main.go
+++ b/main.go
@@ -2,10 +2,12 @@ package main
 
 import (
 	"fmt"
+	"math"
 	"math/rand"
 )
 
 func main() {
 	fmt.Println("Hello World")
 	fmt.Println("My favorite number is", rand.Intn(100))
+	fmt.Println("运算 根号2，结果为 ", math.Sqrt(2))
 }