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Entry039Stage 2 · Grades 3–4数与代数

小数加减法

小数点对齐——相同数位上的数才能相加减。

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Definition

列竖式时把小数点对齐,个位对个位、十分位对十分位,然后按整数加减法计算。规则背后还是那句话:相同计数单位的数才能直接相加减

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