A2一B2=(A+B)(A—B)的充分必要条件是_________.

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问题 A2一B2=(A+B)(A—B)的充分必要条件是_________.

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答案AB=BA

解析 A2一B2=(A+B)(A一B)=A2+BA—AB一B2的充分必要条件是AB=BA.
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