The inverse proposition of the proposition "if xy = 1, then x and y are reciprocal to each other" is______ ．

∵ proposition "if xy = 1, then x and y are reciprocal" ∵ the inverse proposition of the original proposition is: "if x and y are reciprocal, then xy = 1", so the answer is: if x and y are reciprocal, then xy = 1

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