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Mathin
Entry071Stage 3 · Grades 5–6数与代数

负数

表示相反意义的量:零下 3℃ 记作 −3。

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Definition

收入记 +5+5,支出记 5-5;零上零下、海拔高低——相反意义的量用正负号区分。0 是正负的分界,数轴从此向左也延伸出去。

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