How to open the tablet witout button power on and low battery mode?

yesterday,before i sleep,my tablet was 70% (battery).But the next day when i woke up,i open my tablet and my tablet became 3% only and went off.I did not even use it on that night.Now ican not open my tablet and can not charge it.How can i open it with the broken button power on and low baterry mode?????please,,help me fix it.It kind of hard for me to do any work..help me to fix it.I did not want to waste my money.it is possible to fix this problem???help me!!