小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com专题1.2有理数的运算目录有理数的加法运算..........................................................................................................................1有理数的加法应用..........................................................................................................................3有理数加法综合运用......................................................................................................................4有理数的减法运算..........................................................................................................................7有理数的混合运算..........................................................................................................................9有理数混合运算应用....................................................................................................................12有理数混合运算应用....................................................................................................................13有理数的乘法................................................................................................................................16倒数................................................................................................................................................17有理数相乘的正负问题................................................................................................................18有理数的乘法运算律....................................................................................................................19有理数乘法综合运用....................................................................................................................20有理数的除法法则........................................................................................................................22有理数除法与绝对值....................................................................................................................23乘方的概念....................................................................................................................................24乘方与非负性................................................................................................................................26用科学记数法................................................................................................................................27有理数综合运算............................................................................................................................28乘方综合运用................................................................................................................................32有理数的加法运算【例1】计算，结果正确的是A．2B．C．8D．（1）有理数加法法则：同号相加，取相同符号，并把绝对值相加．（2）相关运算律交换律:；结合律.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com【解答】解：，故选：．【变式训练1】的计算结果是A．8B．C．4D．【解答】解：．故选：．【变式训练2】温度由上升是A．B．C．D．【解答】解：根据题意得：，则温度由上升是，故选：．【变式训练3】计算：A．4B．C．10D．【解答】解：原式．故选：．【例2】计算：．【解答】解：．小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com【变式训练1】计算：．【解答】解：．．【解答...