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If you have an alarm company, you should have a main backup battery for your system. Probably the battery has gone dead and is affecting your whole system. You shoud have a panel with wires running into it and a battery should be in there.
Most states require that the smoke detectors now be tied together so that it one goes off they all go off. It is quite possible that you have one or more defective smoke detectors. These things do fail. If you are not familiar with the wiring or electrical circuits I would recommend that you get a qualified electrician to check it out.
Does your smoke detectors have a backup battery? I have electric smoke detectors and if the backup battery needs to be replaced it beeps.
Impossible to tell from far away, not sensible to mess with electrical and security systems without a professional or knowlegeable person physically present. Can't blame you for wondering if there would be advice out there, but someone actually there would be best.