<%@ page language=“java” import=“java.util.*” pageEncoding=“UTF-8”%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"?/"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
两个数的差为:<%=ca.sub() %>
两个数的积为:<%=ca.mul() %>
两个数的商为:<%=ca.div() %>