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交換律

出自維基百科,自由嘅百科全書
交換律即係話兩個運算數嘅次序掉轉咗個運算結果都一樣:

交換律二元運算嘅其中一個屬性,指運算數嘅次序交換咗都唔會影響結果。四則運算入面,都符合交換律,例如咁,就唔符合,例如

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