Mot xi nghiep co 2 phan xuong. So cong nhan o phan xuong thu nhat bang 2/5 so cong nhan phan xuong thu hai . Cuoi nam co 22 cong nhan chuyen tu phan xuong 2 sang phan xuong 1 nen so cong nhan phan xuong 1 bang 5/7 so cong nhan phan xuong 2 tinh so cong nhan moi phan xuong ?