vanstone

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有理数加减混合运算与相反数
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有理数的加减混合运算
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有理数的加法和减法的统一
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正负数符号表示与应用
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引入负数后的数学运算
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相反数的概念
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正数与负数的和
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两个正数、两个负数的和
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减法与负数概念
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字母代表数给我们带来了什么
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用符号语言表示运算规律
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用字母代表数的运算
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文字语言与符号语言
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数字与字母的邂逅
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绝对值 -3
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绝对值 -2
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绝对值 -1
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余角 -3
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余角 -2
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