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因為積為負,所以abc中有一個數為負或者三個數都為負 因為其和為正,所以abc中只有一個數為負 那麼a\|a|、b\|b|、+ c\|c|中只有一個式子為-1, 則a\|a| + b\|b| + c\|c|=1
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