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有理数乘法-2
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有理数乘法
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有理数加减法的混合运算-3
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有理数加减法的混合运算-2
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有理数加减法的混合运算(1)
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有理数减法-2
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有理数减法-1
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有理数的加法-3
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有理数的加法-2
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有理数加法
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绝对值2
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绝对值1
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相反数
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有理数加减混合运算（一）
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用数轴上的点表示有理数（2）
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用数轴上的点表示有理数-1
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负数的引入
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科学计算器的使用
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计算工具的发展
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我们周围的数
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