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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                所有的數學計算都有對象,可以直接寫 ``` double a = double.parse(textBox1.text); //parse 是一個 double 對象的方法,意思為解析,能把我們獲得的 text 自動解析為 double 對象 double resule = math.Sqrt(a); //直接用math. 后面的方法,求平方根。 ``` ![](https://box.kancloud.cn/374b7ef6734b7b817469a23f4f12f61c_499x299.png)
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