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Update 求平方根.md

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Original file line number	Diff line number	Diff line change
`@@ -31,3 +31,28 @@ public class SquareRoot {`
`31`	`31`
`32`	`32`	```
`33`	`33`
	`34`	`+`
	`35`	`+`
	`36`	`+Go 语言：`
	`37`	`+`
	`38`	+```go
	`39`	`+package main`
	`40`	`+`
	`41`	`+import"fmt"`
	`42`	`+`
	`43`	`+funcmain() {`
	`44`	`+num:=8`
	`45`	`+target,left,right:=float64(num),float64(0),float64(num)`
	`46`	`+for right-left >1e-7 {`
	`47`	`+mid:= (left + right) /2`
	`48`	`+if mid*mid > target {`
	`49`	`+right = mid`
	`50`	`+}else {`
	`51`	`+left = mid`
	`52`	`+}`
	`53`	`+}`
	`54`	`+fmt.Println(left)`
	`55`	`+fmt.Println(right)`
	`56`	`+}`
	`57`	+```
	`58`	`+`

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