2012年2月19日 mathcai Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now) 赞赏微信赞赏支付宝赞赏「赏不在多,觉得文章有用,就赞赏下吧!」