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(1)-3的相反数是________;
(2)0的相反数是________;
(3)3与________互为相反数;
(4)-的负倒数是________;
(5)两个数互为相反数,则它们的和是________.
若m、n互为相反数,则m+n=________;若m和n互为倒数,则m×n=________;若m和n互为负倒数,则m×n=________.
如果两个数互为相反数,那么它们的和等于________;如果两个数互为倒数,那么它们的积等于________.