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Switch the two addends and the sum remains the same.
两个数相加,交换加数的位置,他们的和不变。
youdao
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In addition, switch the two addends and the sum remains the same.
两个数相加,交换加数的位置,他们的和不变。
youdao
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In addition, switch the two addends and the sum remains the same.
两个数相加,交换加数的位置,他们的和不变。
youdao