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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)初中数学有理数混合运算知识点描述：有理数为整数(正整数、0、负整数)和分数的统称 。正整数和正分数合称为正有理数，负整数和负分数合称为负有理数。下面是小编整理的初中数学有理数混合运算知识点，仅供参考希望能够帮助到大家。初中数学有理数混合运算知识点(1)有理数混合运算顺序：</a>';
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