A+B=B+ ．

Expressing laws with lettersLaws of operations
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Worked solution

1. 根据加法交换律完成等式

根据加法交换律，两个加数相加，交换加数的位置，和不变。用字母表示为：
A+B=B+AA + B = B + A
因此，等式右边缺失的部分为 AA。

Answer

A

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