n边形共有多少个三角形
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╯^╰〉 document.getElementById("mainFrame").src= "http://batit.aliyun.com/alww.html?id=00000000003727666140";
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>﹏<
window.onload = function () {
╯^╰〉 document.getElementById("mainFrame").src= "http://batit.aliyun.com/alww.html?id=00000000003727666140";
}
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